397420550569 has 9 divisors (see below), whose sum is σ = 462310671837. Its totient is φ = 340642403724.

The previous prime is 397420550551. The next prime is 397420550617. The reversal of 397420550569 is 965055024793.

The square root of 397420550569 is 630413.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 397420550569 - 2⁵ = 397420550537 is a prime.

It is a super-2 number, since 2×397420550569² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397420550069) 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 in 8 ways as a sum of consecutive naturals, for example, 4367862 + ... + 4457920.

Almost surely, 2^397420550569 is an apocalyptic number.

397420550569 is the 630413-rd square number.

397420550569 is the 315207-th centered octagonal number.

It is an amenable number.

397420550569 is a deficient number, since it is larger than the sum of its proper divisors (64890121268).

397420550569 is an frugal number, since it uses more digits than its factorization.

397420550569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180132 (or 90066 counting only the distinct ones).

The product of its (nonzero) digits is 10206000, while the sum is 55.

The spelling of 397420550569 in words is "three hundred ninety-seven billion, four hundred twenty million, five hundred fifty thousand, five hundred sixty-nine".