397525819 has 2 divisors, whose sum is σ = 397525820. Its totient is φ = 397525818.

The previous prime is 397525789. The next prime is 397525829. The reversal of 397525819 is 918525793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397525819 - 2¹¹ = 397523771 is a prime.

It is a super-2 number, since 2×397525819² = 316053553543241522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397525829) 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, 198762909 + 198762910.

It is an arithmetic number, because the mean of its divisors is an integer number (198762910).

Almost surely, 2^397525819 is an apocalyptic number.

397525819 is a deficient number, since it is larger than the sum of its proper divisors (1).

397525819 is an equidigital number, since it uses as much as digits as its factorization.

397525819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 49.

The square root of 397525819 is about 19938.0495284770. The cubic root of 397525819 is about 735.2839965662.

The spelling of 397525819 in words is "three hundred ninety-seven million, five hundred twenty-five thousand, eight hundred nineteen".