397643481 has 45 divisors (see below), whose sum is σ = 637959049. Its totient is φ = 238653888.

The previous prime is 397643437. The next prime is 397643501. The reversal of 397643481 is 184346793.

The square root of 397643481 is 19941.

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

It can be written as a sum of positive squares in 2 ways, for example, as 123409881 + 274233600 = 11109^2 + 16560^2 .

It is not a de Polignac number, because 397643481 - 2²⁷ = 263425753 is a prime.

It is a super-2 number, since 2×397643481² = 316240675963594722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397643401) 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, 17288836 + ... + 17288858.

Almost surely, 2^397643481 is an apocalyptic number.

397643481 is the 19941-st square number.

397643481 is the 9971-st centered octagonal number.

It is an amenable number.

397643481 is a deficient number, since it is larger than the sum of its proper divisors (240315568).

397643481 is an frugal number, since it uses more digits than its factorization.

397643481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 43 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The cubic root of 397643481 is about 735.3565339521.

The spelling of 397643481 in words is "three hundred ninety-seven million, six hundred forty-three thousand, four hundred eighty-one".