397660511 has 2 divisors, whose sum is σ = 397660512. Its totient is φ = 397660510.

The previous prime is 397660453. The next prime is 397660541. The reversal of 397660511 is 115066793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397660511 is a prime.

It is a super-2 number, since 2×397660511² = 316267764017562242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397660541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198830255 + 198830256.

It is an arithmetic number, because the mean of its divisors is an integer number (198830256).

Almost surely, 2^397660511 is an apocalyptic number.

397660511 is a deficient number, since it is larger than the sum of its proper divisors (1).

397660511 is an equidigital number, since it uses as much as digits as its factorization.

397660511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 397660511 is about 19941.4270051067. The cubic root of 397660511 is about 735.3670315826.

The spelling of 397660511 in words is "three hundred ninety-seven million, six hundred sixty thousand, five hundred eleven".