397687 has 2 divisors, whose sum is σ = 397688. Its totient is φ = 397686.

The previous prime is 397673. The next prime is 397697. The reversal of 397687 is 786793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397687 - 2¹⁵ = 364919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198843 + 198844.

It is an arithmetic number, because the mean of its divisors is an integer number (198844).

2³⁹⁷⁶⁸⁷ is an apocalyptic number.

397687 is a deficient number, since it is larger than the sum of its proper divisors (1).

397687 is an equidigital number, since it uses as much as digits as its factorization.

397687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 397687 is about 630.6242938549. The cubic root of 397687 is about 73.5383359333.

The spelling of 397687 in words is "three hundred ninety-seven thousand, six hundred eighty-seven".