3939864 has 32 divisors (see below), whose sum is σ = 9918720. Its totient is φ = 1304096.

The previous prime is 3939851. The next prime is 3939899. The reversal of 3939864 is 4689393.

It is a zygodrome in base 2.

It is a congruent number.

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, 3517 + ... + 4499.

It is an arithmetic number, because the mean of its divisors is an integer number (309960).

Almost surely, 2^3939864 is an apocalyptic number.

It is an amenable number.

3939864 is an abundant number, since it is smaller than the sum of its proper divisors (5978856).

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

3939864 is a wasteful number, since it uses less digits than its factorization.

3939864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1155 counting only the distinct ones).

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

The square root of 3939864 is about 1984.9090659272. The cubic root of 3939864 is about 157.9405854691.

It can be divided in two parts, 39 and 39864, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 3939864 in words is "three million, nine hundred thirty-nine thousand, eight hundred sixty-four".