31402992 has 20 divisors (see below), whose sum is σ = 81124520. Its totient is φ = 10467648.

The previous prime is 31402979. The next prime is 31402993. The reversal of 31402992 is 29920413.

It is a super-2 number, since 2×31402992² = 1972295813104128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327067 + ... + 327162.

It is an arithmetic number, because the mean of its divisors is an integer number (4056226).

Almost surely, 2^31402992 is an apocalyptic number.

It is an amenable number.

31402992 is an abundant number, since it is smaller than the sum of its proper divisors (49721528).

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

31402992 is a wasteful number, since it uses less digits than its factorization.

31402992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654240 (or 654234 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31402992 is about 5603.8372567376. The cubic root of 31402992 is about 315.4934468196.

The spelling of 31402992 in words is "thirty-one million, four hundred two thousand, nine hundred ninety-two".