392188993 has 6 divisors (see below), whose sum is σ = 456219906. Its totient is φ = 336161952.

The previous prime is 392188981. The next prime is 392188999. The reversal of 392188993 is 399881293.

It can be written as a sum of positive squares in only one way, i.e., 372181264 + 20007729 = 19292^2 + 4473^2 .

It is not a de Polignac number, because 392188993 - 2¹⁷ = 392057921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 392188993.

It is not an unprimeable number, because it can be changed into a prime (392188999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4001880 + ... + 4001977.

It is an arithmetic number, because the mean of its divisors is an integer number (76036651).

Almost surely, 2^392188993 is an apocalyptic number.

It is an amenable number.

392188993 is a deficient number, since it is larger than the sum of its proper divisors (64030913).

392188993 is an equidigital number, since it uses as much as digits as its factorization.

392188993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003871 (or 8003864 counting only the distinct ones).

The product of its digits is 839808, while the sum is 52.

The square root of 392188993 is about 19803.7620920875. The cubic root of 392188993 is about 731.9787392921.

The spelling of 392188993 in words is "three hundred ninety-two million, one hundred eighty-eight thousand, nine hundred ninety-three".