397197855 has 24 divisors (see below), whose sum is σ = 689032032. Its totient is φ = 211667904.

The previous prime is 397197841. The next prime is 397197881. The reversal of 397197855 is 558791793.

It is not a de Polignac number, because 397197855 - 2¹¹ = 397195807 is a prime.

It is a super-2 number, since 2×397197855² = 315532272033202050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69102 + ... + 74628.

It is an arithmetic number, because the mean of its divisors is an integer number (28709668).

Almost surely, 2^397197855 is an apocalyptic number.

397197855 is a deficient number, since it is larger than the sum of its proper divisors (291834177).

397197855 is a wasteful number, since it uses less digits than its factorization.

397197855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135 (or 7132 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The square root of 397197855 is about 19929.8232556137. The cubic root of 397197855 is about 735.0817346284.

It can be divided in two parts, 39719 and 7855, that added together give a palindrome (47574).

The spelling of 397197855 in words is "three hundred ninety-seven million, one hundred ninety-seven thousand, eight hundred fifty-five".