155998988 has 12 divisors (see below), whose sum is σ = 273085680. Its totient is φ = 77974512.

The previous prime is 155998979. The next prime is 155999027. The reversal of 155998988 is 889899551.

It is a self number, because there is not a number n which added to its sum of digits gives 155998988.

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, 21353 + ... + 27711.

It is an arithmetic number, because the mean of its divisors is an integer number (22757140).

Almost surely, 2^155998988 is an apocalyptic number.

It is an amenable number.

155998988 is a deficient number, since it is larger than the sum of its proper divisors (117086692).

155998988 is a wasteful number, since it uses less digits than its factorization.

155998988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496 (or 12494 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 62.

The square root of 155998988 is about 12489.9554843082. The cubic root of 155998988 is about 538.3200971440.

The spelling of 155998988 in words is "one hundred fifty-five million, nine hundred ninety-eight thousand, nine hundred eighty-eight".