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159440 = 2451993
BaseRepresentation
bin100110111011010000
322002201012
4212323100
520100230
63230052
71232561
oct467320
9262635
10159440
11a9876
1278328
1357758
1442168
1532395
hex26ed0

159440 has 20 divisors (see below), whose sum is σ = 370884. Its totient is φ = 63744.

The previous prime is 159437. The next prime is 159457. The reversal of 159440 is 44951.

It is a happy number.

159440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

159440 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 87616 + 71824 = 296^2 + 268^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1594402 = 50842227200, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917 + ... + 1076.

2159440 is an apocalyptic number.

159440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159440 is an abundant number, since it is smaller than the sum of its proper divisors (211444).

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

159440 is a wasteful number, since it uses less digits than its factorization.

159440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006 (or 2000 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 159440 is about 399.2993864258. The cubic root of 159440 is about 54.2249418843.

The spelling of 159440 in words is "one hundred fifty-nine thousand, four hundred forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 1993 3986 7972 9965 15944 19930 31888 39860 79720 159440