30968639 has 4 divisors (see below), whose sum is σ = 33350856. Its totient is φ = 28586424.

The previous prime is 30968617. The next prime is 30968657. The reversal of 30968639 is 93686903.

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 30968639 - 2¹² = 30964543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30968639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30968939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191089 + ... + 1191114.

It is an arithmetic number, because the mean of its divisors is an integer number (8337714).

Almost surely, 2^30968639 is an apocalyptic number.

30968639 is a deficient number, since it is larger than the sum of its proper divisors (2382217).

30968639 is a wasteful number, since it uses less digits than its factorization.

30968639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382216.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 30968639 is about 5564.9473492568. The cubic root of 30968639 is about 314.0320974126.

The spelling of 30968639 in words is "thirty million, nine hundred sixty-eight thousand, six hundred thirty-nine".