394656599089 has 3 divisors (see below), whose sum is σ = 394657227307. Its totient is φ = 394655970872.

The previous prime is 394656598997. The next prime is 394656599137. The reversal of 394656599089 is 980995656493.

The square root of 394656599089 is 628217.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 290709680625 + 103946918464 = 539175^2 + 322408^2 .

It is not a de Polignac number, because 394656599089 - 2¹⁵ = 394656566321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394650599089) 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, 314109 + ... + 942325.

Almost surely, 2^394656599089 is an apocalyptic number.

394656599089 is the 628217-th square number.

394656599089 is the 314109-th centered octagonal number.

It is an amenable number.

394656599089 is a deficient number, since it is larger than the sum of its proper divisors (628218).

394656599089 is an frugal number, since it uses more digits than its factorization.

394656599089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256434 (or 628217 counting only the distinct ones).

The product of its (nonzero) digits is 566870400, while the sum is 73.

The spelling of 394656599089 in words is "three hundred ninety-four billion, six hundred fifty-six million, five hundred ninety-nine thousand, eighty-nine".