3993864 has 32 divisors (see below), whose sum is σ = 11411520. Its totient is φ = 1141056.

The previous prime is 3993859. The next prime is 3993889. The reversal of 3993864 is 4683993.

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

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, 11719 + ... + 12054.

It is an arithmetic number, because the mean of its divisors is an integer number (356610).

Almost surely, 2^3993864 is an apocalyptic number.

It is an amenable number.

3993864 is an abundant number, since it is smaller than the sum of its proper divisors (7417656).

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

3993864 is a wasteful number, since it uses less digits than its factorization.

3993864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23789 (or 23785 counting only the distinct ones).

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

The square root of 3993864 is about 1998.4654112593. The cubic root of 3993864 is about 158.6588945498.

The spelling of 3993864 in words is "three million, nine hundred ninety-three thousand, eight hundred sixty-four".