155331992 has 64 divisors (see below), whose sum is σ = 331776000. Its totient is φ = 67723776.

The previous prime is 155331989. The next prime is 155332003. The reversal of 155331992 is 299133551.

It is a happy number.

155331992 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 120809 + ... + 122087.

It is an arithmetic number, because the mean of its divisors is an integer number (5184000).

Almost surely, 2^155331992 is an apocalyptic number.

It is an amenable number.

155331992 is an abundant number, since it is smaller than the sum of its proper divisors (176444008).

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

155331992 is a wasteful number, since it uses less digits than its factorization.

155331992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1364 counting only the distinct ones).

The product of its digits is 36450, while the sum is 38.

The square root of 155331992 is about 12463.2255856981. The cubic root of 155331992 is about 537.5517795439.

The spelling of 155331992 in words is "one hundred fifty-five million, three hundred thirty-one thousand, nine hundred ninety-two".