155992 has 32 divisors (see below), whose sum is σ = 328320. Its totient is φ = 69120.

The previous prime is 155921. The next prime is 156007. The reversal of 155992 is 299551.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4198 + ... + 4234.

It is an arithmetic number, because the mean of its divisors is an integer number (10260).

2¹⁵⁵⁹⁹² is an apocalyptic number.

It is an amenable number.

155992 is an abundant number, since it is smaller than the sum of its proper divisors (172328).

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

155992 is a wasteful number, since it uses less digits than its factorization.

155992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 87 counting only the distinct ones).

The product of its digits is 4050, while the sum is 31.

The square root of 155992 is about 394.9582256391. The cubic root of 155992 is about 53.8312058979.

Subtracting from 155992 its sum of digits (31), we obtain a triangular number (155961 = T₅₅₈).

The spelling of 155992 in words is "one hundred fifty-five thousand, nine hundred ninety-two".