396321870681 has 45 divisors (see below), whose sum is σ = 650853077413. Its totient is φ = 240157300680.

The previous prime is 396321870643. The next prime is 396321870697. The reversal of 396321870681 is 186078123693.

The square root of 396321870681 is 629541.

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

It is a de Polignac number, because none of the positive numbers 2^k-396321870681 is a prime.

It is a super-2 number, since 2×396321870681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (396321870631) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 62321380 + ... + 62327738.

Almost surely, 2^396321870681 is an apocalyptic number.

396321870681 is the 629541-st square number.

396321870681 is the 314771-st centered octagonal number.

It is an amenable number.

396321870681 is a deficient number, since it is larger than the sum of its proper divisors (254531206732).

396321870681 is an frugal number, since it uses more digits than its factorization.

396321870681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12752 (or 6373 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 396321870681 in words is "three hundred ninety-six billion, three hundred twenty-one million, eight hundred seventy thousand, six hundred eighty-one".