155864 has 8 divisors (see below), whose sum is σ = 292260. Its totient is φ = 77928.

The previous prime is 155863. The next prime is 155887. The reversal of 155864 is 468551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155861) by changing a digit.

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 as a sum of consecutive naturals, namely, 9734 + ... + 9749.

2¹⁵⁵⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

155864 is a deficient number, since it is larger than the sum of its proper divisors (136396).

155864 is a wasteful number, since it uses less digits than its factorization.

155864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19489 (or 19485 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 155864 is about 394.7961499306. The cubic root of 155864 is about 53.8164780489.

The spelling of 155864 in words is "one hundred fifty-five thousand, eight hundred sixty-four".