397267279 has 2 divisors, whose sum is σ = 397267280. Its totient is φ = 397267278.

The previous prime is 397267249. The next prime is 397267289. The reversal of 397267279 is 972762793.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397267279 - 2⁷ = 397267151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397267249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198633639 + 198633640.

It is an arithmetic number, because the mean of its divisors is an integer number (198633640).

Almost surely, 2^397267279 is an apocalyptic number.

397267279 is a deficient number, since it is larger than the sum of its proper divisors (1).

397267279 is an equidigital number, since it uses as much as digits as its factorization.

397267279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 52.

The square root of 397267279 is about 19931.5648908960. The cubic root of 397267279 is about 735.1245590804.

The spelling of 397267279 in words is "three hundred ninety-seven million, two hundred sixty-seven thousand, two hundred seventy-nine".