30979813 has 8 divisors (see below), whose sum is σ = 31520448. Its totient is φ = 30442464.

The previous prime is 30979811. The next prime is 30979843. The reversal of 30979813 is 31897903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30979813 - 2¹ = 30979811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30979811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24720 + ... + 25942.

It is an arithmetic number, because the mean of its divisors is an integer number (3940056).

Almost surely, 2^30979813 is an apocalyptic number.

It is an amenable number.

30979813 is a deficient number, since it is larger than the sum of its proper divisors (540635).

30979813 is a wasteful number, since it uses less digits than its factorization.

30979813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 30979813 is about 5565.9512214895. The cubic root of 30979813 is about 314.0698622054.

The spelling of 30979813 in words is "thirty million, nine hundred seventy-nine thousand, eight hundred thirteen".