30990947 has 4 divisors (see below), whose sum is σ = 33374880. Its totient is φ = 28607016.

The previous prime is 30990943. The next prime is 30990961. The reversal of 30990947 is 74909903.

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

It is a cyclic number.

It is not a de Polignac number, because 30990947 - 2² = 30990943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30990943) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1191947 + ... + 1191972.

It is an arithmetic number, because the mean of its divisors is an integer number (8343720).

Almost surely, 2^30990947 is an apocalyptic number.

30990947 is a deficient number, since it is larger than the sum of its proper divisors (2383933).

30990947 is a wasteful number, since it uses less digits than its factorization.

30990947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383932.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 30990947 is about 5566.9513200674. The cubic root of 30990947 is about 314.1074827791.

The spelling of 30990947 in words is "thirty million, nine hundred ninety thousand, nine hundred forty-seven".