30905806 has 4 divisors (see below), whose sum is σ = 46358712. Its totient is φ = 15452902.

The previous prime is 30905789. The next prime is 30905821. The reversal of 30905806 is 60850903.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7726450 + ... + 7726453.

It is an arithmetic number, because the mean of its divisors is an integer number (11589678).

Almost surely, 2^30905806 is an apocalyptic number.

30905806 is a deficient number, since it is larger than the sum of its proper divisors (15452906).

30905806 is a wasteful number, since it uses less digits than its factorization.

30905806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15452905.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 30905806 is about 5559.2990565358. The cubic root of 30905806 is about 313.8195712453.

The spelling of 30905806 in words is "thirty million, nine hundred five thousand, eight hundred six".