397661481 has 56 divisors (see below), whose sum is σ = 687278400. Its totient is φ = 225278496.

The previous prime is 397661479. The next prime is 397661503. The reversal of 397661481 is 184166793.

It is a happy number.

It is not a de Polignac number, because 397661481 - 2¹ = 397661479 is a prime.

It is a super-2 number, since 2×397661481² = 316269306942226722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397661401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 760086 + ... + 760608.

Almost surely, 2^397661481 is an apocalyptic number.

It is an amenable number.

397661481 is a deficient number, since it is larger than the sum of its proper divisors (289616919).

397661481 is an equidigital number, since it uses as much as digits as its factorization.

397661481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 682 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 397661481 is about 19941.4513263203. The cubic root of 397661481 is about 735.3676295009.

The spelling of 397661481 in words is "three hundred ninety-seven million, six hundred sixty-one thousand, four hundred eighty-one".