386972639 has 8 divisors (see below), whose sum is σ = 407677440. Its totient is φ = 366301656.

The previous prime is 386972633. The next prime is 386972647. The reversal of 386972639 is 936279683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386972639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386972633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17042 + ... + 32624.

It is an arithmetic number, because the mean of its divisors is an integer number (50959680).

Almost surely, 2^386972639 is an apocalyptic number.

386972639 is a deficient number, since it is larger than the sum of its proper divisors (20704801).

386972639 is a wasteful number, since it uses less digits than its factorization.

386972639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16909.

The product of its digits is 2939328, while the sum is 53.

The square root of 386972639 is about 19671.6201417168. The cubic root of 386972639 is about 728.7189887624.

The spelling of 386972639 in words is "three hundred eighty-six million, nine hundred seventy-two thousand, six hundred thirty-nine".