30900155 has 32 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 19831680.

The previous prime is 30900151. The next prime is 30900193. The reversal of 30900155 is 55100903.

It is not a de Polignac number, because 30900155 - 2² = 30900151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 30900155.

It is not an unprimeable number, because it can be changed into a prime (30900151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15506 + ... + 17384.

It is an arithmetic number, because the mean of its divisors is an integer number (1421280).

Almost surely, 2^30900155 is an apocalyptic number.

30900155 is a deficient number, since it is larger than the sum of its proper divisors (14580805).

30900155 is a wasteful number, since it uses less digits than its factorization.

30900155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 30900155 is about 5558.7907857735. The cubic root of 30900155 is about 313.8004432051.

The spelling of 30900155 in words is "thirty million, nine hundred thousand, one hundred fifty-five".