155900985 has 16 divisors (see below), whose sum is σ = 262570560. Its totient is φ = 78770880.

The previous prime is 155900977. The next prime is 155900989. The reversal of 155900985 is 589009551.

It is a happy number.

155900985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155900985 - 2³ = 155900977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155900989) 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, 273226 + ... + 273795.

It is an arithmetic number, because the mean of its divisors is an integer number (16410660).

Almost surely, 2^155900985 is an apocalyptic number.

155900985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155900985 is a deficient number, since it is larger than the sum of its proper divisors (106669575).

155900985 is a wasteful number, since it uses less digits than its factorization.

155900985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547048.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 155900985 is about 12486.0315953469. The cubic root of 155900985 is about 538.2073441986.

The spelling of 155900985 in words is "one hundred fifty-five million, nine hundred thousand, nine hundred eighty-five".