155816 has 8 divisors (see below), whose sum is σ = 292170. Its totient is φ = 77904.

The previous prime is 155809. The next prime is 155821. The reversal of 155816 is 618551.

It can be written as a sum of positive squares in only one way, i.e., 119716 + 36100 = 346^2 + 190^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9731 + ... + 9746.

2¹⁵⁵⁸¹⁶ is an apocalyptic number.

It is an amenable number.

155816 is a deficient number, since it is larger than the sum of its proper divisors (136354).

155816 is a wasteful number, since it uses less digits than its factorization.

155816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19483 (or 19479 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 155816 is about 394.7353543832. The cubic root of 155816 is about 53.8109530267.

The spelling of 155816 in words is "one hundred fifty-five thousand, eight hundred sixteen".