30490905 has 32 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 15803840.

The previous prime is 30490891. The next prime is 30490909. The reversal of 30490905 is 50909403.

It is not a de Polignac number, because 30490905 - 2⁶ = 30490841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30490909) 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, 115804 + ... + 116066.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^30490905 is an apocalyptic number.

It is an amenable number.

30490905 is a deficient number, since it is larger than the sum of its proper divisors (19690215).

30490905 is a wasteful number, since it uses less digits than its factorization.

30490905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 30490905 is about 5521.8570245887. The cubic root of 30490905 is about 312.4089291955.

The spelling of 30490905 in words is "thirty million, four hundred ninety thousand, nine hundred five".