397876961 has 2 divisors, whose sum is σ = 397876962. Its totient is φ = 397876960.

The previous prime is 397876951. The next prime is 397876987. The reversal of 397876961 is 169678793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200052736 + 197824225 = 14144^2 + 14065^2 .

It is an emirp because it is prime and its reverse (169678793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397876961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 397876897 and 397876906.

It is not a weakly prime, because it can be changed into another prime (397876901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198938480 + 198938481.

It is an arithmetic number, because the mean of its divisors is an integer number (198938481).

Almost surely, 2^397876961 is an apocalyptic number.

It is an amenable number.

397876961 is a deficient number, since it is larger than the sum of its proper divisors (1).

397876961 is an equidigital number, since it uses as much as digits as its factorization.

397876961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 397876961 is about 19946.8534110019. The cubic root of 397876961 is about 735.5004295600.

The spelling of 397876961 in words is "three hundred ninety-seven million, eight hundred seventy-six thousand, nine hundred sixty-one".