30431992 has 8 divisors (see below), whose sum is σ = 57060000. Its totient is φ = 15215992.

The previous prime is 30431981. The next prime is 30432011. The reversal of 30431992 is 29913403.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×30431992² = 1852212274176128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1901992 + ... + 1902007.

It is an arithmetic number, because the mean of its divisors is an integer number (7132500).

Almost surely, 2^30431992 is an apocalyptic number.

It is an amenable number.

30431992 is a deficient number, since it is larger than the sum of its proper divisors (26628008).

30431992 is a wasteful number, since it uses less digits than its factorization.

30431992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804005 (or 3804001 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 30431992 is about 5516.5199174842. The cubic root of 30431992 is about 312.2075925051.

The spelling of 30431992 in words is "thirty million, four hundred thirty-one thousand, nine hundred ninety-two".