397816285 has 8 divisors (see below), whose sum is σ = 478404576. Its totient is φ = 317569680.

The previous prime is 397816283. The next prime is 397816313. The reversal of 397816285 is 582618793.

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

It is not a de Polignac number, because 397816285 - 2¹ = 397816283 is a prime.

It is a super-2 number, since 2×397816285² = 316515593222402450, 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 (397816283) 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, 82851 + ... + 87520.

It is an arithmetic number, because the mean of its divisors is an integer number (59800572).

Almost surely, 2^397816285 is an apocalyptic number.

It is an amenable number.

397816285 is a deficient number, since it is larger than the sum of its proper divisors (80588291).

397816285 is a wasteful number, since it uses less digits than its factorization.

397816285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170843.

The product of its digits is 725760, while the sum is 49.

The square root of 397816285 is about 19945.3324113688. The cubic root of 397816285 is about 735.4630398665.

The spelling of 397816285 in words is "three hundred ninety-seven million, eight hundred sixteen thousand, two hundred eighty-five".