155640856 has 48 divisors (see below), whose sum is σ = 357355800. Its totient is φ = 63189504.

The previous prime is 155640811. The next prime is 155640857. The reversal of 155640856 is 658046551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155640857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3001 + ... + 17896.

Almost surely, 2^155640856 is an apocalyptic number.

It is an amenable number.

155640856 is an abundant number, since it is smaller than the sum of its proper divisors (201714944).

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

155640856 is a wasteful number, since it uses less digits than its factorization.

155640856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20936 (or 20925 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 155640856 is about 12475.6104459862. The cubic root of 155640856 is about 537.9078351263.

The spelling of 155640856 in words is "one hundred fifty-five million, six hundred forty thousand, eight hundred fifty-six".