390892921489 has 6 divisors (see below), whose sum is σ = 454712174034. Its totient is φ = 335051075520.

The previous prime is 390892921487. The next prime is 390892921519. The reversal of 390892921489 is 984129298093.

It can be written as a sum of positive squares in only one way, i.e., 385899379264 + 4993542225 = 621208^2 + 70665^2 .

It is not a de Polignac number, because 390892921489 - 2¹ = 390892921487 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 390892921489.

It is not an unprimeable number, because it can be changed into a prime (390892921487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3988703232 + ... + 3988703329.

It is an arithmetic number, because the mean of its divisors is an integer number (75785362339).

Almost surely, 2^390892921489 is an apocalyptic number.

It is an amenable number.

390892921489 is a deficient number, since it is larger than the sum of its proper divisors (63819252545).

390892921489 is an equidigital number, since it uses as much as digits as its factorization.

390892921489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7977406575 (or 7977406568 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 64.

The spelling of 390892921489 in words is "three hundred ninety billion, eight hundred ninety-two million, nine hundred twenty-one thousand, four hundred eighty-nine".