39897984 has 64 divisors (see below), whose sum is σ = 121127040. Its totient is φ = 11398656.

The previous prime is 39897959. The next prime is 39897989. The reversal of 39897984 is 48979893.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39897989) 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, 4734 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (1892610).

Almost surely, 2^39897984 is an apocalyptic number.

It is an amenable number.

39897984 is an abundant number, since it is smaller than the sum of its proper divisors (81229056).

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

39897984 is a wasteful number, since it uses less digits than its factorization.

39897984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14867 (or 14855 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 39897984 is about 6316.4850985338. The cubic root of 39897984 is about 341.7042003052.

The spelling of 39897984 in words is "thirty-nine million, eight hundred ninety-seven thousand, nine hundred eighty-four".