397651427 has 2 divisors, whose sum is σ = 397651428. Its totient is φ = 397651426.

The previous prime is 397651411. The next prime is 397651433. The reversal of 397651427 is 724156793.

It is a strong prime.

It is an emirp because it is prime and its reverse (724156793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397651427 - 2⁴ = 397651411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397651127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198825713 + 198825714.

It is an arithmetic number, because the mean of its divisors is an integer number (198825714).

Almost surely, 2^397651427 is an apocalyptic number.

397651427 is a deficient number, since it is larger than the sum of its proper divisors (1).

397651427 is an equidigital number, since it uses as much as digits as its factorization.

397651427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 44.

The square root of 397651427 is about 19941.1992367560. The cubic root of 397651427 is about 735.3614320618.

The spelling of 397651427 in words is "three hundred ninety-seven million, six hundred fifty-one thousand, four hundred twenty-seven".