397970957 has 2 divisors, whose sum is σ = 397970958. Its totient is φ = 397970956.

The previous prime is 397970897. The next prime is 397970983. The reversal of 397970957 is 759079793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255072841 + 142898116 = 15971^2 + 11954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397970957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397972957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198985478 + 198985479.

It is an arithmetic number, because the mean of its divisors is an integer number (198985479).

Almost surely, 2^397970957 is an apocalyptic number.

It is an amenable number.

397970957 is a deficient number, since it is larger than the sum of its proper divisors (1).

397970957 is an equidigital number, since it uses as much as digits as its factorization.

397970957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3750705, while the sum is 56.

The square root of 397970957 is about 19949.2094329575. The cubic root of 397970957 is about 735.5583441598.

The spelling of 397970957 in words is "three hundred ninety-seven million, nine hundred seventy thousand, nine hundred fifty-seven".