155890 has 32 divisors (see below), whose sum is σ = 342144. Its totient is φ = 49920.

The previous prime is 155887. The next prime is 155891. The reversal of 155890 is 98551.

It is not an unprimeable number, because it can be changed into a prime (155891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (10692).

2¹⁵⁵⁸⁹⁰ is an apocalyptic number.

155890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155890 is an abundant number, since it is smaller than the sum of its proper divisors (186254).

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

155890 is a wasteful number, since it uses less digits than its factorization.

155890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 155890 is about 394.8290769434. The cubic root of 155890 is about 53.8194702956.

The spelling of 155890 in words is "one hundred fifty-five thousand, eight hundred ninety".