30640839 has 8 divisors (see below), whose sum is σ = 40887792. Its totient is φ = 20410560.

The previous prime is 30640829. The next prime is 30640843. The reversal of 30640839 is 93804603.

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

It is not a de Polignac number, because 30640839 - 2⁴ = 30640823 is a prime.

It is a super-2 number, since 2×30640839² = 1877722029247842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640829) 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, 1059 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (5110974).

Almost surely, 2^30640839 is an apocalyptic number.

30640839 is a deficient number, since it is larger than the sum of its proper divisors (10246953).

30640839 is a wasteful number, since it uses less digits than its factorization.

30640839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8337.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 30640839 is about 5535.4167864760. The cubic root of 30640839 is about 312.9201652758.

The spelling of 30640839 in words is "thirty million, six hundred forty thousand, eight hundred thirty-nine".