30904155 has 24 divisors (see below), whose sum is σ = 53765712. Its totient is φ = 16421184.

The previous prime is 30904151. The next prime is 30904177. The reversal of 30904155 is 55140903.

It is not a de Polignac number, because 30904155 - 2² = 30904151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30904151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12697 + ... + 14933.

It is an arithmetic number, because the mean of its divisors is an integer number (2240238).

Almost surely, 2^30904155 is an apocalyptic number.

30904155 is a deficient number, since it is larger than the sum of its proper divisors (22861557).

30904155 is a wasteful number, since it uses less digits than its factorization.

30904155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 30904155 is about 5559.1505646097. The cubic root of 30904155 is about 313.8139830252.

The spelling of 30904155 in words is "thirty million, nine hundred four thousand, one hundred fifty-five".