3928689 has 16 divisors (see below), whose sum is σ = 5855040. Its totient is φ = 2603520.

The previous prime is 3928681. The next prime is 3928703. The reversal of 3928689 is 9868293.

It is not a de Polignac number, because 3928689 - 2³ = 3928681 is a prime.

3928689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3928681) 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, 5809 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (365940).

Almost surely, 2^3928689 is an apocalyptic number.

It is an amenable number.

3928689 is a deficient number, since it is larger than the sum of its proper divisors (1926351).

3928689 is a wasteful number, since it uses less digits than its factorization.

3928689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877 (or 871 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 3928689 is about 1982.0920765696. The cubic root of 3928689 is about 157.7911169080.

The spelling of 3928689 in words is "three million, nine hundred twenty-eight thousand, six hundred eighty-nine".