397249637 has 2 divisors, whose sum is σ = 397249638. Its totient is φ = 397249636.

The previous prime is 397249603. The next prime is 397249639. The reversal of 397249637 is 736942793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388523521 + 8726116 = 19711^2 + 2954^2 .

It is a cyclic number.

It is not a de Polignac number, because 397249637 - 2¹⁶ = 397184101 is a prime.

Together with 397249639, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397249639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198624818 + 198624819.

It is an arithmetic number, because the mean of its divisors is an integer number (198624819).

Almost surely, 2^397249637 is an apocalyptic number.

It is an amenable number.

397249637 is a deficient number, since it is larger than the sum of its proper divisors (1).

397249637 is an equidigital number, since it uses as much as digits as its factorization.

397249637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 50.

The square root of 397249637 is about 19931.1223216356. The cubic root of 397249637 is about 735.1136770201.

The spelling of 397249637 in words is "three hundred ninety-seven million, two hundred forty-nine thousand, six hundred thirty-seven".