30977912 has 32 divisors (see below), whose sum is σ = 67050720. Its totient is φ = 13142400.

The previous prime is 30977911. The next prime is 30977929. The reversal of 30977912 is 21977903.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30977911) 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, 2918 + ... + 8394.

It is an arithmetic number, because the mean of its divisors is an integer number (2095335).

Almost surely, 2^30977912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30977912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33525360).

30977912 is an abundant number, since it is smaller than the sum of its proper divisors (36072808).

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

30977912 is a wasteful number, since it uses less digits than its factorization.

30977912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 30977912 is about 5565.7804484187. The cubic root of 30977912 is about 314.0634380326.

Subtracting from 30977912 its reverse (21977903), we obtain a palindrome (9000009).

The spelling of 30977912 in words is "thirty million, nine hundred seventy-seven thousand, nine hundred twelve".