39942532408 has 8 divisors (see below), whose sum is σ = 74892248280. Its totient is φ = 19971266200.

The previous prime is 39942532391. The next prime is 39942532453. The reversal of 39942532408 is 80423524993.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496408268 + ... + 2496408283.

It is an arithmetic number, because the mean of its divisors is an integer number (9361531035).

Almost surely, 2^39942532408 is an apocalyptic number.

It is an amenable number.

39942532408 is a deficient number, since it is larger than the sum of its proper divisors (34949715872).

39942532408 is a wasteful number, since it uses less digits than its factorization.

39942532408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992816557 (or 4992816553 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 39942532408 in words is "thirty-nine billion, nine hundred forty-two million, five hundred thirty-two thousand, four hundred eight".