30992155 has 16 divisors (see below), whose sum is σ = 40150080. Its totient is φ = 22895488.

The previous prime is 30992147. The next prime is 30992161. The reversal of 30992155 is 55129903.

It is a happy number.

It is not a de Polignac number, because 30992155 - 2³ = 30992147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30992155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1312 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (2509380).

Almost surely, 2^30992155 is an apocalyptic number.

30992155 is a deficient number, since it is larger than the sum of its proper divisors (9157925).

30992155 is a wasteful number, since it uses less digits than its factorization.

30992155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9350.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 30992155 is about 5567.0598164561. The cubic root of 30992155 is about 314.1115639377. Note that the first 3 decimals are identical.

The spelling of 30992155 in words is "thirty million, nine hundred ninety-two thousand, one hundred fifty-five".