398342748736 has 21 divisors (see below), whose sum is σ = 790471411561. Its totient is φ = 199168849792.

The previous prime is 398342748733. The next prime is 398342748757. The reversal of 398342748736 is 637847243893.

The square root of 398342748736 is 631144.

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., 154449000000 + 243893748736 = 393000^2 + 493856^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398342748733) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5009706 + ... + 5088598.

Almost surely, 2^398342748736 is an apocalyptic number.

398342748736 is the 631144-th square number.

It is an amenable number.

398342748736 is a deficient number, since it is larger than the sum of its proper divisors (392128662825).

398342748736 is an frugal number, since it uses more digits than its factorization.

398342748736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157798 (or 78895 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 64.

Multiplying 398342748736 by its sum of digits (64), we get a square (25493935919104 = 5049152²).

398342748736 divided by its sum of digits (64) gives a square (6224105449 = 78893²).

The spelling of 398342748736 in words is "three hundred ninety-eight billion, three hundred forty-two million, seven hundred forty-eight thousand, seven hundred thirty-six".