30431989 has 24 divisors (see below), whose sum is σ = 37822400. Its totient is φ = 24470208.

The previous prime is 30431981. The next prime is 30432011. The reversal of 30431989 is 98913403.

It is not a de Polignac number, because 30431989 - 2³ = 30431981 is a prime.

It is a super-2 number, since 2×30431989² = 1852211908992242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30431981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98974 + ... + 99280.

Almost surely, 2^30431989 is an apocalyptic number.

It is an amenable number.

30431989 is a deficient number, since it is larger than the sum of its proper divisors (7390411).

30431989 is an equidigital number, since it uses as much as digits as its factorization.

30431989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 30431989 is about 5516.5196455736. The cubic root of 30431989 is about 312.2075822460.

The spelling of 30431989 in words is "thirty million, four hundred thirty-one thousand, nine hundred eighty-nine".