397689529 has 2 divisors, whose sum is σ = 397689530. Its totient is φ = 397689528.

The previous prime is 397689511. The next prime is 397689563. The reversal of 397689529 is 925986793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393109929 + 4579600 = 19827^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 397689529 - 2¹³ = 397681337 is a prime.

It is a super-2 number, since 2×397689529² = 316313922952483682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397689329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198844764 + 198844765.

It is an arithmetic number, because the mean of its divisors is an integer number (198844765).

Almost surely, 2^397689529 is an apocalyptic number.

It is an amenable number.

397689529 is a deficient number, since it is larger than the sum of its proper divisors (1).

397689529 is an equidigital number, since it uses as much as digits as its factorization.

397689529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 58.

The square root of 397689529 is about 19942.1545726634. The cubic root of 397689529 is about 735.3849181642.

The spelling of 397689529 in words is "three hundred ninety-seven million, six hundred eighty-nine thousand, five hundred twenty-nine".