30939040 has 48 divisors (see below), whose sum is σ = 79742880. Its totient is φ = 11249920.

The previous prime is 30939001. The next prime is 30939043. The reversal of 30939040 is 4093903.

It is a super-2 number, since 2×30939040² = 1914448392243200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30939043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7030 + ... + 10549.

It is an arithmetic number, because the mean of its divisors is an integer number (1661310).

Almost surely, 2^30939040 is an apocalyptic number.

It is an amenable number.

30939040 is an abundant number, since it is smaller than the sum of its proper divisors (48803840).

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

30939040 is a wasteful number, since it uses less digits than its factorization.

30939040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17605 (or 17597 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 30939040 is about 5562.2872993041. The cubic root of 30939040 is about 313.9320176842.

The spelling of 30939040 in words is "thirty million, nine hundred thirty-nine thousand, forty".