392445997 has 4 divisors (see below), whose sum is σ = 392826940. Its totient is φ = 392065056.

The previous prime is 392445979. The next prime is 392446031. The reversal of 392445997 is 799544293.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 314494756 + 77951241 = 17734^2 + 8829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-392445997 is a prime.

It is a super-2 number, since 2×392445997² = 308027721122648018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392445917) 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, 188922 + ... + 190987.

It is an arithmetic number, because the mean of its divisors is an integer number (98206735).

Almost surely, 2^392445997 is an apocalyptic number.

It is an amenable number.

392445997 is a deficient number, since it is larger than the sum of its proper divisors (380943).

392445997 is a wasteful number, since it uses less digits than its factorization.

392445997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380942.

The product of its digits is 2449440, while the sum is 52.

The square root of 392445997 is about 19810.2497965069. The cubic root of 392445997 is about 732.1385945233.

The spelling of 392445997 in words is "three hundred ninety-two million, four hundred forty-five thousand, nine hundred ninety-seven".