39813408 has 36 divisors (see below), whose sum is σ = 113220198. Its totient is φ = 13271040.

The previous prime is 39813407. The next prime is 39813413. The reversal of 39813408 is 80431893.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 725904 = 6252^2 + 852^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (39813401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68833 + ... + 69408.

Almost surely, 2^39813408 is an apocalyptic number.

It is an amenable number.

39813408 is an abundant number, since it is smaller than the sum of its proper divisors (73406790).

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

39813408 is a wasteful number, since it uses less digits than its factorization.

39813408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138257 (or 138246 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 39813408 is about 6309.7866841915. The cubic root of 39813408 is about 341.4625805840.

The spelling of 39813408 in words is "thirty-nine million, eight hundred thirteen thousand, four hundred eight".