397507427 has 2 divisors, whose sum is σ = 397507428. Its totient is φ = 397507426.

The previous prime is 397507403. The next prime is 397507441. The reversal of 397507427 is 724705793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397507427 - 2²⁰ = 396458851 is a prime.

It is not a weakly prime, because it can be changed into another prime (397507927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198753713 + 198753714.

It is an arithmetic number, because the mean of its divisors is an integer number (198753714).

Almost surely, 2^397507427 is an apocalyptic number.

397507427 is a deficient number, since it is larger than the sum of its proper divisors (1).

397507427 is an equidigital number, since it uses as much as digits as its factorization.

397507427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 44.

The square root of 397507427 is about 19937.5882944753. The cubic root of 397507427 is about 735.2726567981.

The spelling of 397507427 in words is "three hundred ninety-seven million, five hundred seven thousand, four hundred twenty-seven".