156400865 has 8 divisors (see below), whose sum is σ = 189503808. Its totient is φ = 123905520.

The previous prime is 156400841. The next prime is 156400877. The reversal of 156400865 is 568004651.

It is a happy number.

156400865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 156400865 - 2¹⁶ = 156335329 is a prime.

It is a super-2 number, since 2×156400865² = 48922461145496450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151331 + ... + 152360.

It is an arithmetic number, because the mean of its divisors is an integer number (23687976).

Almost surely, 2^156400865 is an apocalyptic number.

It is an amenable number.

156400865 is a deficient number, since it is larger than the sum of its proper divisors (33102943).

156400865 is a wasteful number, since it uses less digits than its factorization.

156400865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303799.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 156400865 is about 12506.0331440469. The cubic root of 156400865 is about 538.7819654342.

The spelling of 156400865 in words is "one hundred fifty-six million, four hundred thousand, eight hundred sixty-five".