397637407 has 2 divisors, whose sum is σ = 397637408. Its totient is φ = 397637406.

The previous prime is 397637369. The next prime is 397637411. The reversal of 397637407 is 704736793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397637407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397637477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198818703 + 198818704.

It is an arithmetic number, because the mean of its divisors is an integer number (198818704).

Almost surely, 2^397637407 is an apocalyptic number.

397637407 is a deficient number, since it is larger than the sum of its proper divisors (1).

397637407 is an equidigital number, since it uses as much as digits as its factorization.

397637407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 666792, while the sum is 46.

The square root of 397637407 is about 19940.8477001355. The cubic root of 397637407 is about 735.3527897453.

The spelling of 397637407 in words is "three hundred ninety-seven million, six hundred thirty-seven thousand, four hundred seven".