39981984 has 48 divisors (see below), whose sum is σ = 119947968. Its totient is φ = 11423232.

The previous prime is 39981983. The next prime is 39982001. The reversal of 39981984 is 48918993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (39981983) 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, 29077 + ... + 30420.

It is an arithmetic number, because the mean of its divisors is an integer number (2498916).

Almost surely, 2^39981984 is an apocalyptic number.

It is an amenable number.

39981984 is an abundant number, since it is smaller than the sum of its proper divisors (79965984).

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

39981984 is a wasteful number, since it uses less digits than its factorization.

39981984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59517 (or 59509 counting only the distinct ones).

The product of its digits is 559872, while the sum is 51.

The square root of 39981984 is about 6323.1308700675. The cubic root of 39981984 is about 341.9438367471.

The spelling of 39981984 in words is "thirty-nine million, nine hundred eighty-one thousand, nine hundred eighty-four".