31345740 has 36 divisors (see below), whose sum is σ = 95082624. Its totient is φ = 8358816.

The previous prime is 31345703. The next prime is 31345789. The reversal of 31345740 is 4754313.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31345740² = 1965110832295200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86892 + ... + 87251.

It is an arithmetic number, because the mean of its divisors is an integer number (2641184).

Almost surely, 2^31345740 is an apocalyptic number.

31345740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31345740 is an abundant number, since it is smaller than the sum of its proper divisors (63736884).

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

31345740 is a wasteful number, since it uses less digits than its factorization.

31345740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174158 (or 174153 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 31345740 is about 5598.7266409426. The cubic root of 31345740 is about 315.3016007811.

The spelling of 31345740 in words is "thirty-one million, three hundred forty-five thousand, seven hundred forty".