39981492 has 24 divisors (see below), whose sum is σ = 103656000. Its totient is φ = 13327128.

The previous prime is 39981479. The next prime is 39981493. The reversal of 39981492 is 29418993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39981493) 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, 184992 + ... + 185207.

It is an arithmetic number, because the mean of its divisors is an integer number (4319000).

Almost surely, 2^39981492 is an apocalyptic number.

It is an amenable number.

39981492 is an abundant number, since it is smaller than the sum of its proper divisors (63674508).

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

39981492 is a wasteful number, since it uses less digits than its factorization.

39981492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370212 (or 370204 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 39981492 is about 6323.0919651702. The cubic root of 39981492 is about 341.9424341399.

The spelling of 39981492 in words is "thirty-nine million, nine hundred eighty-one thousand, four hundred ninety-two".