397943279 has 2 divisors, whose sum is σ = 397943280. Its totient is φ = 397943278.

The previous prime is 397943207. The next prime is 397943317. The reversal of 397943279 is 972349793.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (972349793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397943279 - 2¹⁶ = 397877743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397943279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397943479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198971639 + 198971640.

It is an arithmetic number, because the mean of its divisors is an integer number (198971640).

Almost surely, 2^397943279 is an apocalyptic number.

397943279 is a deficient number, since it is larger than the sum of its proper divisors (1).

397943279 is an equidigital number, since it uses as much as digits as its factorization.

397943279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 53.

The square root of 397943279 is about 19948.5157091950. The cubic root of 397943279 is about 735.5412916124.

The spelling of 397943279 in words is "three hundred ninety-seven million, nine hundred forty-three thousand, two hundred seventy-nine".