397751 has 2 divisors, whose sum is σ = 397752. Its totient is φ = 397750.

The previous prime is 397729. The next prime is 397753. The reversal of 397751 is 157793.

397751 is nontrivially palindromic in base 5.

It is a strong prime.

It is an emirp because it is prime and its reverse (157793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397751 - 2⁶ = 397687 is a prime.

It is a Sophie Germain prime.

Together with 397753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397751.

It is not a weakly prime, because it can be changed into another prime (397753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198875 + 198876.

It is an arithmetic number, because the mean of its divisors is an integer number (198876).

2³⁹⁷⁷⁵¹ is an apocalyptic number.

397751 is a deficient number, since it is larger than the sum of its proper divisors (1).

397751 is an equidigital number, since it uses as much as digits as its factorization.

397751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615, while the sum is 32.

The square root of 397751 is about 630.6750351806. The cubic root of 397751 is about 73.5422805774.

The spelling of 397751 in words is "three hundred ninety-seven thousand, seven hundred fifty-one".