392640885 has 128 divisors (see below), whose sum is σ = 887685120. Its totient is φ = 160185600.

The previous prime is 392640883. The next prime is 392640893. The reversal of 392640885 is 588046293.

392640885 = 1673² + 1674² + ... + 1802².

It is not a de Polignac number, because 392640885 - 2¹ = 392640883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 392640885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392640883) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 380320 + ... + 381350.

It is an arithmetic number, because the mean of its divisors is an integer number (6935040).

Almost surely, 2^392640885 is an apocalyptic number.

392640885 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

392640885 is an abundant number, since it is smaller than the sum of its proper divisors (495044235).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

392640885 is a wasteful number, since it uses less digits than its factorization.

392640885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 392640885 is about 19815.1680537915. The cubic root of 392640885 is about 732.2597673853.

The spelling of 392640885 in words is "three hundred ninety-two million, six hundred forty thousand, eight hundred eighty-five".