397807511 has 2 divisors, whose sum is σ = 397807512. Its totient is φ = 397807510.

The previous prime is 397807507. The next prime is 397807513. The reversal of 397807511 is 115708793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397807511 - 2² = 397807507 is a prime.

Together with 397807513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397807513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198903755 + 198903756.

It is an arithmetic number, because the mean of its divisors is an integer number (198903756).

Almost surely, 2^397807511 is an apocalyptic number.

397807511 is a deficient number, since it is larger than the sum of its proper divisors (1).

397807511 is an equidigital number, since it uses as much as digits as its factorization.

397807511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 397807511 is about 19945.1124589459. The cubic root of 397807511 is about 735.4576328479.

The spelling of 397807511 in words is "three hundred ninety-seven million, eight hundred seven thousand, five hundred eleven".