3970639 has 12 divisors (see below), whose sum is σ = 4443984. Its totient is φ = 3534912.

The previous prime is 3970633. The next prime is 3970643. The reversal of 3970639 is 9360793.

It is not a de Polignac number, because 3970639 - 2¹⁹ = 3446351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3970598 and 3970607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3970633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5814 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (370332).

Almost surely, 2^3970639 is an apocalyptic number.

3970639 is a deficient number, since it is larger than the sum of its proper divisors (473345).

3970639 is a wasteful number, since it uses less digits than its factorization.

3970639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 3970639 is about 1992.6462305186. The cubic root of 3970639 is about 158.3507536389.

The spelling of 3970639 in words is "three million, nine hundred seventy thousand, six hundred thirty-nine".