397985601321 has 81 divisors (see below), whose sum is σ = 735313098429. Its totient is φ = 206670063600.

The previous prime is 397985601313. The next prime is 397985601323. The reversal of 397985601321 is 123106589793.

The square root of 397985601321 is 630861.

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

397985601321 is a `hidden beast` number, since 3 + 9 + 7 + 9 + 8 + 5 + 601 + 3 + 21 = 666.

It is not a de Polignac number, because 397985601321 - 2³ = 397985601313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397985601323) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 145727526 + ... + 145730256.

Almost surely, 2^397985601321 is an apocalyptic number.

397985601321 is the 630861-st square number.

397985601321 is the 315431-st centered octagonal number.

It is an amenable number.

397985601321 is a deficient number, since it is larger than the sum of its proper divisors (337327497108).

397985601321 is an equidigital number, since it uses as much as digits as its factorization.

397985601321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504 (or 2752 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 397985601321 in words is "three hundred ninety-seven billion, nine hundred eighty-five million, six hundred one thousand, three hundred twenty-one".