31406740 has 24 divisors (see below), whose sum is σ = 67200840. Its totient is φ = 12325248.

The previous prime is 31406737. The next prime is 31406741. The reversal of 31406740 is 4760413.

It can be written as a sum of positive squares in 4 ways, for example, as 12152196 + 19254544 = 3486^2 + 4388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31406741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13755 + ... + 15874.

It is an arithmetic number, because the mean of its divisors is an integer number (2800035).

Almost surely, 2^31406740 is an apocalyptic number.

It is an amenable number.

31406740 is an abundant number, since it is smaller than the sum of its proper divisors (35794100).

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

31406740 is a wasteful number, since it uses less digits than its factorization.

31406740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29691 (or 29689 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 31406740 is about 5604.1716604687. The cubic root of 31406740 is about 315.5059978784.

The spelling of 31406740 in words is "thirty-one million, four hundred six thousand, seven hundred forty".