397714721 has 2 divisors, whose sum is σ = 397714722. Its totient is φ = 397714720.

The previous prime is 397714673. The next prime is 397714727. The reversal of 397714721 is 127417793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366186496 + 31528225 = 19136^2 + 5615^2 .

It is a cyclic number.

It is not a de Polignac number, because 397714721 - 2¹⁴ = 397698337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (397714727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198857360 + 198857361.

It is an arithmetic number, because the mean of its divisors is an integer number (198857361).

Almost surely, 2^397714721 is an apocalyptic number.

It is an amenable number.

397714721 is a deficient number, since it is larger than the sum of its proper divisors (1).

397714721 is an equidigital number, since it uses as much as digits as its factorization.

397714721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 397714721 is about 19942.7861894972. The cubic root of 397714721 is about 735.4004457088.

The spelling of 397714721 in words is "three hundred ninety-seven million, seven hundred fourteen thousand, seven hundred twenty-one".