30861904 has 10 divisors (see below), whose sum is σ = 59794970. Its totient is φ = 15430944.

The previous prime is 30861899. The next prime is 30861937. The reversal of 30861904 is 40916803.

It can be written as a sum of positive squares in only one way, i.e., 18045504 + 12816400 = 4248^2 + 3580^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964419 + ... + 964450.

It is an arithmetic number, because the mean of its divisors is an integer number (5979497).

Almost surely, 2^30861904 is an apocalyptic number.

It is an amenable number.

30861904 is a deficient number, since it is larger than the sum of its proper divisors (28933066).

30861904 is a wasteful number, since it uses less digits than its factorization.

30861904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928877 (or 1928871 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 30861904 is about 5555.3491339429. The cubic root of 30861904 is about 313.6709062386.

The spelling of 30861904 in words is "thirty million, eight hundred sixty-one thousand, nine hundred four".