3931389 has 64 divisors (see below), whose sum is σ = 7618560. Its totient is φ = 1944000.

The previous prime is 3931387. The next prime is 3931393. The reversal of 3931389 is 9831393.

It is not a de Polignac number, because 3931389 - 2¹ = 3931387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931387) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64419 + ... + 64479.

It is an arithmetic number, because the mean of its divisors is an integer number (119040).

Almost surely, 2^3931389 is an apocalyptic number.

It is an amenable number.

3931389 is a deficient number, since it is larger than the sum of its proper divisors (3687171).

3931389 is a wasteful number, since it uses less digits than its factorization.

3931389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 113 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3931389 is about 1982.7730581184. The cubic root of 3931389 is about 157.8272560590.

The spelling of 3931389 in words is "three million, nine hundred thirty-one thousand, three hundred eighty-nine".