3864399 has 16 divisors (see below), whose sum is σ = 6424320. Its totient is φ = 2007360.

The previous prime is 3864349. The next prime is 3864403. The reversal of 3864399 is 9934683.

3864399 = 216² + 217² + ... + 278².

It is not a de Polignac number, because 3864399 - 2⁹ = 3863887 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3864399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3864319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8134 + ... + 8595.

It is an arithmetic number, because the mean of its divisors is an integer number (401520).

Almost surely, 2^3864399 is an apocalyptic number.

3864399 is a deficient number, since it is larger than the sum of its proper divisors (2559921).

3864399 is a wasteful number, since it uses less digits than its factorization.

3864399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16750.

The product of its digits is 139968, while the sum is 42.

The square root of 3864399 is about 1965.8074676834. The cubic root of 3864399 is about 156.9256683577.

The spelling of 3864399 in words is "three million, eight hundred sixty-four thousand, three hundred ninety-nine".