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239378140 = 22554721881
BaseRepresentation
bin11100100010010…
…01111011011100
3121200102200002001
432101021323130
5442240100030
635430412044
75634452311
oct1621117334
9550380061
10239378140
11113139381
1268201024
133a793a91
1423b12d08
1516036cca
hexe449edc

239378140 has 24 divisors (see below), whose sum is σ = 503636112. Its totient is φ = 95571840.

The previous prime is 239378101. The next prime is 239378141. The reversal of 239378140 is 41873932.

239378140 is a nontrivial binomial coefficient, being equal to C(21881, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 239378140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239378141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 21880.

It is an arithmetic number, because the mean of its divisors is an integer number (20984838).

Almost surely, 2239378140 is an apocalyptic number.

239378140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

239378140 is the 21880-th triangular number.

239378140 is the 7294-th centered nonagonal number.

It is an amenable number.

239378140 is an abundant number, since it is smaller than the sum of its proper divisors (264257972).

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

239378140 is a wasteful number, since it uses less digits than its factorization.

239378140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22437 (or 22435 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 239378140 is about 15471.8499217127. The cubic root of 239378140 is about 620.9092970524.

The spelling of 239378140 in words is "two hundred thirty-nine million, three hundred seventy-eight thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 547 1094 2188 2735 5470 10940 21881 43762 87524 109405 218810 437620 11968907 23937814 47875628 59844535 119689070 239378140