397995869 has 8 divisors (see below), whose sum is σ = 419278080. Its totient is φ = 376747200.

The previous prime is 397995863. The next prime is 397995881. The reversal of 397995869 is 968599793.

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

It is not a de Polignac number, because 397995869 - 2²⁴ = 381218653 is a prime.

It is a super-2 number, since 2×397995869² = 316801423482130322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397995863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18164 + ... + 33554.

It is an arithmetic number, because the mean of its divisors is an integer number (52409760).

Almost surely, 2^397995869 is an apocalyptic number.

It is an amenable number.

397995869 is a deficient number, since it is larger than the sum of its proper divisors (21282211).

397995869 is a wasteful number, since it uses less digits than its factorization.

397995869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16771.

The product of its digits is 33067440, while the sum is 65.

The square root of 397995869 is about 19949.8338088316. The cubic root of 397995869 is about 735.5736918854.

The spelling of 397995869 in words is "three hundred ninety-seven million, nine hundred ninety-five thousand, eight hundred sixty-nine".