30979906 has 4 divisors (see below), whose sum is σ = 46469862. Its totient is φ = 15489952.

The previous prime is 30979901. The next prime is 30979939. The reversal of 30979906 is 60997903.

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

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 9865881 = 4595^2 + 3141^2 .

It is not an unprimeable number, because it can be changed into a prime (30979901) 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 as a sum of consecutive naturals, namely, 7744975 + ... + 7744978.

Almost surely, 2^30979906 is an apocalyptic number.

30979906 is a deficient number, since it is larger than the sum of its proper divisors (15489956).

30979906 is a wasteful number, since it uses less digits than its factorization.

30979906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489955.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 30979906 is about 5565.9595758503. The cubic root of 30979906 is about 314.0701764796.

The spelling of 30979906 in words is "thirty million, nine hundred seventy-nine thousand, nine hundred six".