397522819 has 2 divisors, whose sum is σ = 397522820. Its totient is φ = 397522818.

The previous prime is 397522789. The next prime is 397522847. The reversal of 397522819 is 918225793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397522819 - 2¹³ = 397514627 is a prime.

It is a super-4 number, since 4×397522819⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (397522219) 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, 198761409 + 198761410.

It is an arithmetic number, because the mean of its divisors is an integer number (198761410).

Almost surely, 2^397522819 is an apocalyptic number.

397522819 is a deficient number, since it is larger than the sum of its proper divisors (1).

397522819 is an equidigital number, since it uses as much as digits as its factorization.

397522819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 397522819 is about 19937.9742952989. The cubic root of 397522819 is about 735.2821469106.

The spelling of 397522819 in words is "three hundred ninety-seven million, five hundred twenty-two thousand, eight hundred nineteen".