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155840140 = 22553791861
BaseRepresentation
bin10010100100111…
…10111010001100
3101212020111111001
421102132322030
5304343341030
623244110044
73601422301
oct1122367214
9355214431
10155840140
117aa71005
1244235324
1326395201
14169a90a8
15da34cca
hex949ee8c

155840140 has 48 divisors (see below), whose sum is σ = 337841280. Its totient is φ = 60353280.

The previous prime is 155840137. The next prime is 155840141. The reversal of 155840140 is 41048551.

155840140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1558401402 = 48572298470439200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155840099 and 155840108.

It is not an unprimeable number, because it can be changed into a prime (155840141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82810 + ... + 84670.

It is an arithmetic number, because the mean of its divisors is an integer number (7038360).

Almost surely, 2155840140 is an apocalyptic number.

155840140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155840140 is an abundant number, since it is smaller than the sum of its proper divisors (182001140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155840140 is a wasteful number, since it uses less digits than its factorization.

155840140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 2000 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 155840140 is about 12483.5948348222. The cubic root of 155840140 is about 538.1373179423.

Adding to 155840140 its reverse (41048551), we get a palindrome (196888691).

The spelling of 155840140 in words is "one hundred fifty-five million, eight hundred forty thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 53 79 106 158 212 265 316 395 530 790 1060 1580 1861 3722 4187 7444 8374 9305 16748 18610 20935 37220 41870 83740 98633 147019 197266 294038 394532 493165 588076 735095 986330 1470190 1972660 2940380 7792007 15584014 31168028 38960035 77920070 155840140