392974639 has 4 divisors (see below), whose sum is σ = 393144424. Its totient is φ = 392804856.

The previous prime is 392974613. The next prime is 392974667. The reversal of 392974639 is 936479293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936479293 = 23 ⋅40716491.

It is a cyclic number.

It is not a de Polignac number, because 392974639 - 2⁵ = 392974607 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 (392974609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81372 + ... + 86065.

It is an arithmetic number, because the mean of its divisors is an integer number (98286106).

Almost surely, 2^392974639 is an apocalyptic number.

392974639 is a deficient number, since it is larger than the sum of its proper divisors (169785).

392974639 is a wasteful number, since it uses less digits than its factorization.

392974639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169784.

The product of its digits is 2204496, while the sum is 52.

The square root of 392974639 is about 19823.5879446683. The cubic root of 392974639 is about 732.4671879753.

The spelling of 392974639 in words is "three hundred ninety-two million, nine hundred seventy-four thousand, six hundred thirty-nine".