398594796295921 has 9 divisors (see below), whose sum is σ = 420678010843083. Its totient is φ = 377615763439560.

The previous prime is 398594796295907. The next prime is 398594796295931. The reversal of 398594796295921 is 129592697495893.

It is a happy number.

The square root of 398594796295921 is 19964839.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 83337016045921 + 315257780250000 = 9128911^2 + 17755500^2 .

It is a de Polignac number, because none of the positive numbers 2^k-398594796295921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398594796295931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 378806551 + ... + 379857331.

It is an arithmetic number, because the mean of its divisors is an integer number (46742001204787).

Almost surely, 2^{398594796295921} is an apocalyptic number.

398594796295921 is the 19964839-th square number.

398594796295921 is the 9982420-th centered octagonal number.

It is an amenable number.

398594796295921 is a deficient number, since it is larger than the sum of its proper divisors (22083214547162).

398594796295921 is an frugal number, since it uses more digits than its factorization.

398594796295921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101600 (or 1050800 counting only the distinct ones).

The product of its digits is 23808556800, while the sum is 88.

The spelling of 398594796295921 in words is "three hundred ninety-eight trillion, five hundred ninety-four billion, seven hundred ninety-six million, two hundred ninety-five thousand, nine hundred twenty-one".