3990399 has 32 divisors (see below), whose sum is σ = 6535680. Its totient is φ = 2115072.

The previous prime is 3990383. The next prime is 3990419. The reversal of 3990399 is 9930993.

It is not a de Polignac number, because 3990399 - 2⁴ = 3990383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3990399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29059 + ... + 29195.

It is an arithmetic number, because the mean of its divisors is an integer number (204240).

Almost surely, 2^3990399 is an apocalyptic number.

3990399 is a deficient number, since it is larger than the sum of its proper divisors (2545281).

3990399 is a wasteful number, since it uses less digits than its factorization.

3990399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 59049, while the sum is 42.

The square root of 3990399 is about 1997.5983079688. The cubic root of 3990399 is about 158.6129981338.

The spelling of 3990399 in words is "three million, nine hundred ninety thousand, three hundred ninety-nine".