39899408 has 30 divisors (see below), whose sum is σ = 82066734. Its totient is φ = 18727168.

The previous prime is 39899401. The next prime is 39899417. The reversal of 39899408 is 80499893.

It can be written as a sum of positive squares in only one way, i.e., 37552384 + 2347024 = 6128^2 + 1532^2 .

It is not an unprimeable number, because it can be changed into a prime (39899401) 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, 103985 + ... + 104367.

Almost surely, 2^39899408 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 39899408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41033367).

39899408 is an abundant number, since it is smaller than the sum of its proper divisors (42167326).

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

39899408 is an equidigital number, since it uses as much as digits as its factorization.

39899408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 39899408 is about 6316.5978184463. The cubic root of 39899408 is about 341.7082655147.

The spelling of 39899408 in words is "thirty-nine million, eight hundred ninety-nine thousand, four hundred eight".