2155639892 has 12 divisors (see below), whose sum is σ = 4311279840. Its totient is φ = 923845656.

The previous prime is 2155639891. The next prime is 2155639909. The reversal of 2155639892 is 2989365512.

2155639892 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155639892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155639891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38493542 + ... + 38493597.

It is an arithmetic number, because the mean of its divisors is an integer number (359273320).

Almost surely, 2^2155639892 is an apocalyptic number.

It is an amenable number.

2155639892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2155639892 is a wasteful number, since it uses less digits than its factorization.

2155639892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76987150 (or 76987148 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 50.

The square root of 2155639892 is about 46428.8691656387. The cubic root of 2155639892 is about 1291.7904533205.

The spelling of 2155639892 in words is "two billion, one hundred fifty-five million, six hundred thirty-nine thousand, eight hundred ninety-two".