3979647 has 24 divisors (see below), whose sum is σ = 6624800. Its totient is φ = 2255040.

The previous prime is 3979643. The next prime is 3979663. The reversal of 3979647 is 7469793.

It is not a de Polignac number, because 3979647 - 2² = 3979643 is a prime.

3979647 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3979643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11229 + ... + 11577.

Almost surely, 2^3979647 is an apocalyptic number.

3979647 is the 1629-th pentagonal number.

3979647 is a deficient number, since it is larger than the sum of its proper divisors (2645153).

3979647 is a wasteful number, since it uses less digits than its factorization.

3979647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 540 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 3979647 is about 1994.9052609084. The cubic root of 3979647 is about 158.4704108074.

The spelling of 3979647 in words is "three million, nine hundred seventy-nine thousand, six hundred forty-seven".