3999408 has 40 divisors (see below), whose sum is σ = 11808768. Its totient is φ = 1142592.

The previous prime is 3999389. The next prime is 3999421. The reversal of 3999408 is 8049993.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 3999408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5616 + ... + 6287.

Almost surely, 2^3999408 is an apocalyptic number.

It is an amenable number.

3999408 is an abundant number, since it is smaller than the sum of its proper divisors (7809360).

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

3999408 is a wasteful number, since it uses less digits than its factorization.

3999408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11921 (or 11915 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 3999408 is about 1999.8519945236. The cubic root of 3999408 is about 158.7322736319.

The spelling of 3999408 in words is "three million, nine hundred ninety-nine thousand, four hundred eight".