30731940 has 48 divisors (see below), whose sum is σ = 95612160. Its totient is φ = 8195040.

The previous prime is 30731917. The next prime is 30731947. The reversal of 30731940 is 4913703.

30731940 is a `hidden beast` number, since 307 + 319 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30731947) 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, 27916 + ... + 28995.

It is an arithmetic number, because the mean of its divisors is an integer number (1991920).

Almost surely, 2^30731940 is an apocalyptic number.

30731940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30731940 is an abundant number, since it is smaller than the sum of its proper divisors (64880220).

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

30731940 is a wasteful number, since it uses less digits than its factorization.

30731940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56929 (or 56921 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 30731940 is about 5543.6395986752. The cubic root of 30731940 is about 313.2299820096.

The spelling of 30731940 in words is "thirty million, seven hundred thirty-one thousand, nine hundred forty".