392989813 has 2 divisors, whose sum is σ = 392989814. Its totient is φ = 392989812.

The previous prime is 392989801. The next prime is 392989819. The reversal of 392989813 is 318989293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321198084 + 71791729 = 17922^2 + 8473^2 .

It is a cyclic number.

It is not a de Polignac number, because 392989813 - 2⁵ = 392989781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (392989819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196494906 + 196494907.

It is an arithmetic number, because the mean of its divisors is an integer number (196494907).

Almost surely, 2^392989813 is an apocalyptic number.

It is an amenable number.

392989813 is a deficient number, since it is larger than the sum of its proper divisors (1).

392989813 is an equidigital number, since it uses as much as digits as its factorization.

392989813 is an evil number, because the sum of its binary digits is even.

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

The square root of 392989813 is about 19823.9706668467. The cubic root of 392989813 is about 732.4766154827.

The spelling of 392989813 in words is "three hundred ninety-two million, nine hundred eighty-nine thousand, eight hundred thirteen".