39666940 has 12 divisors (see below), whose sum is σ = 83300616. Its totient is φ = 15866768.

The previous prime is 39666917. The next prime is 39666943. The reversal of 39666940 is 4966693.

It is a super-2 number, since 2×39666940² = 3146932257927200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39666943) 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, 991654 + ... + 991693.

It is an arithmetic number, because the mean of its divisors is an integer number (6941718).

Almost surely, 2^39666940 is an apocalyptic number.

It is an amenable number.

39666940 is an abundant number, since it is smaller than the sum of its proper divisors (43633676).

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

39666940 is a wasteful number, since it uses less digits than its factorization.

39666940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983356 (or 1983354 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 39666940 is about 6298.1695753608. The cubic root of 39666940 is about 341.0433349066.

The spelling of 39666940 in words is "thirty-nine million, six hundred sixty-six thousand, nine hundred forty".