39971904 has 56 divisors (see below), whose sum is σ = 120871488. Its totient is φ = 11420160.

The previous prime is 39971903. The next prime is 39971917. The reversal of 39971904 is 40917993.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (39971903) 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, 13527 + ... + 16214.

Almost surely, 2^39971904 is an apocalyptic number.

It is an amenable number.

39971904 is an abundant number, since it is smaller than the sum of its proper divisors (80899584).

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

39971904 is a wasteful number, since it uses less digits than its factorization.

39971904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29763 (or 29753 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 39971904 is about 6322.3337463313. Note that the first 3 decimals coincide. The cubic root of 39971904 is about 341.9150981067.

The spelling of 39971904 in words is "thirty-nine million, nine hundred seventy-one thousand, nine hundred four".