30431945 has 16 divisors (see below), whose sum is σ = 37705728. Its totient is φ = 23561280.

The previous prime is 30431941. The next prime is 30431957. The reversal of 30431945 is 54913403.

It is not a de Polignac number, because 30431945 - 2² = 30431941 is a prime.

It is a super-2 number, since 2×30431945² = 1852206552966050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30431941) 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, 49832 + ... + 50438.

It is an arithmetic number, because the mean of its divisors is an integer number (2356608).

Almost surely, 2^30431945 is an apocalyptic number.

It is an amenable number.

30431945 is a deficient number, since it is larger than the sum of its proper divisors (7273783).

30431945 is a wasteful number, since it uses less digits than its factorization.

30431945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 30431945 is about 5516.5156575505. The cubic root of 30431945 is about 312.2074317778.

The spelling of 30431945 in words is "thirty million, four hundred thirty-one thousand, nine hundred forty-five".