39980815 has 24 divisors (see below), whose sum is σ = 56881440. Its totient is φ = 26889408.

The previous prime is 39980813. The next prime is 39980827. The reversal of 39980815 is 51808993.

It is not a de Polignac number, because 39980815 - 2¹ = 39980813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39980813) 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, 11446 + ... + 14524.

It is an arithmetic number, because the mean of its divisors is an integer number (2370060).

Almost surely, 2^39980815 is an apocalyptic number.

39980815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

39980815 is a deficient number, since it is larger than the sum of its proper divisors (16900625).

39980815 is a wasteful number, since it uses less digits than its factorization.

39980815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151 (or 3144 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 39980815 is about 6323.0384310077. The cubic root of 39980815 is about 341.9405041107.

The spelling of 39980815 in words is "thirty-nine million, nine hundred eighty thousand, eight hundred fifteen".