30531940 has 12 divisors (see below), whose sum is σ = 64117116. Its totient is φ = 12212768.

The previous prime is 30531929. The next prime is 30531953. The reversal of 30531940 is 4913503.

It can be written as a sum of positive squares in 2 ways, for example, as 22202944 + 8328996 = 4712^2 + 2886^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763279 + ... + 763318.

It is an arithmetic number, because the mean of its divisors is an integer number (5343093).

Almost surely, 2^30531940 is an apocalyptic number.

It is an amenable number.

30531940 is an abundant number, since it is smaller than the sum of its proper divisors (33585176).

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

30531940 is a wasteful number, since it uses less digits than its factorization.

30531940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526606 (or 1526604 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 30531940 is about 5525.5714636588. The cubic root of 30531940 is about 312.5490141786.

The spelling of 30531940 in words is "thirty million, five hundred thirty-one thousand, nine hundred forty".