392645993 has 8 divisors (see below), whose sum is σ = 406446600. Its totient is φ = 378862848.

The previous prime is 392645983. The next prime is 392645999. The reversal of 392645993 is 399546293.

It can be written as a sum of positive squares in 4 ways, for example, as 76090729 + 316555264 = 8723^2 + 17792^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 392645993 - 2¹⁴ = 392629609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (392645999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55505 + ... + 62177.

It is an arithmetic number, because the mean of its divisors is an integer number (50805825).

Almost surely, 2^392645993 is an apocalyptic number.

It is an amenable number.

392645993 is a deficient number, since it is larger than the sum of its proper divisors (13800607).

392645993 is a wasteful number, since it uses less digits than its factorization.

392645993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8731.

The product of its digits is 1574640, while the sum is 50.

The square root of 392645993 is about 19815.2969445325. The cubic root of 392645993 is about 732.2629427777.

The spelling of 392645993 in words is "three hundred ninety-two million, six hundred forty-five thousand, nine hundred ninety-three".