155900 has 18 divisors (see below), whose sum is σ = 338520. Its totient is φ = 62320.

The previous prime is 155893. The next prime is 155921. The reversal of 155900 is 9551.

155900 is digitally balanced in base 2, 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 (20).

It is a congruent number.

It is an unprimeable number.

155900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 680 + ... + 879.

2¹⁵⁵⁹⁰⁰ is an apocalyptic number.

155900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155900 is an abundant number, since it is smaller than the sum of its proper divisors (182620).

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

155900 is a wasteful number, since it uses less digits than its factorization.

155900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 155900 is about 394.8417404480. The cubic root of 155900 is about 53.8206210711.

The spelling of 155900 in words is "one hundred fifty-five thousand, nine hundred".