30979842 has 16 divisors (see below), whose sum is σ = 65220960. Its totient is φ = 9783072.

The previous prime is 30979811. The next prime is 30979843. The reversal of 30979842 is 24897903.

It is a super-2 number, since 2×30979842² = 1919501220689928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30979794 and 30979803.

It is not an unprimeable number, because it can be changed into a prime (30979843) 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, 135763 + ... + 135990.

It is an arithmetic number, because the mean of its divisors is an integer number (4076310).

Almost surely, 2^30979842 is an apocalyptic number.

30979842 is an abundant number, since it is smaller than the sum of its proper divisors (34241118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30979842 is a wasteful number, since it uses less digits than its factorization.

30979842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271777.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 30979842 is about 5565.9538266141. The cubic root of 30979842 is about 314.0699602050.

The spelling of 30979842 in words is "thirty million, nine hundred seventy-nine thousand, eight hundred forty-two".