39985764 has 72 divisors (see below), whose sum is σ = 116903808. Its totient is φ = 10543680.

The previous prime is 39985763. The next prime is 39985769. The reversal of 39985764 is 46758993.

It is a super-2 number, since 2×39985764² = 3197722645327392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39985763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5029 + ... + 10259.

It is an arithmetic number, because the mean of its divisors is an integer number (1623664).

Almost surely, 2^39985764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39985764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58451904).

39985764 is an abundant number, since it is smaller than the sum of its proper divisors (76918044).

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

39985764 is a wasteful number, since it uses less digits than its factorization.

39985764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265 (or 5256 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 39985764 is about 6323.4297655624. The cubic root of 39985764 is about 341.9546124919.

The spelling of 39985764 in words is "thirty-nine million, nine hundred eighty-five thousand, seven hundred sixty-four".