30939402 has 32 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 9397440.

The previous prime is 30939373. The next prime is 30939407. The reversal of 30939402 is 20493903.

It is a super-2 number, since 2×30939402² = 1914493192235208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30939402.

It is not an unprimeable number, because it can be changed into a prime (30939407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3652 + ... + 8672.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^30939402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30939402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

30939402 is an abundant number, since it is smaller than the sum of its proper divisors (36556278).

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

30939402 is a wasteful number, since it uses less digits than its factorization.

30939402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 30939402 is about 5562.3198397791. The cubic root of 30939402 is about 313.9332420590.

The spelling of 30939402 in words is "thirty million, nine hundred thirty-nine thousand, four hundred two".