31425684 has 12 divisors (see below), whose sum is σ = 73326624. Its totient is φ = 10475224.

The previous prime is 31425683. The next prime is 31425727. The reversal of 31425684 is 48652413.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31425684² = 1975147229735712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31425683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1309392 + ... + 1309415.

It is an arithmetic number, because the mean of its divisors is an integer number (6110552).

Almost surely, 2^31425684 is an apocalyptic number.

It is an amenable number.

31425684 is an abundant number, since it is smaller than the sum of its proper divisors (41900940).

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

31425684 is a wasteful number, since it uses less digits than its factorization.

31425684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618814 (or 2618812 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 31425684 is about 5605.8615751729. The cubic root of 31425684 is about 315.5694210406.

The spelling of 31425684 in words is "thirty-one million, four hundred twenty-five thousand, six hundred eighty-four".