397761565 has 8 divisors (see below), whose sum is σ = 480243168. Its totient is φ = 316256400.

The previous prime is 397761557. The next prime is 397761571. The reversal of 397761565 is 565167793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397761565 - 2³ = 397761557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 243211 + ... + 244840.

It is an arithmetic number, because the mean of its divisors is an integer number (60030396).

Almost surely, 2^397761565 is an apocalyptic number.

It is an amenable number.

397761565 is a deficient number, since it is larger than the sum of its proper divisors (82481603).

397761565 is a wasteful number, since it uses less digits than its factorization.

397761565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488219.

The product of its digits is 1190700, while the sum is 49.

The square root of 397761565 is about 19943.9606146823. The cubic root of 397761565 is about 735.4293171119.

The spelling of 397761565 in words is "three hundred ninety-seven million, seven hundred sixty-one thousand, five hundred sixty-five".