397531800 has 240 divisors, whose sum is σ = 1409775840. Its totient is φ = 103783680.

The previous prime is 397531787. The next prime is 397531819. The reversal of 397531800 is 8135793.

It is a super-2 number, since 2×397531800² = 316063064022480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 858369 + ... + 858831.

It is an arithmetic number, because the mean of its divisors is an integer number (5874066).

Almost surely, 2^397531800 is an apocalyptic number.

397531800 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397531800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704887920).

397531800 is an abundant number, since it is smaller than the sum of its proper divisors (1012244040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397531800 is a wasteful number, since it uses less digits than its factorization.

397531800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 397531800 is about 19938.1995175091. The cubic root of 397531800 is about 735.2876841351.

The spelling of 397531800 in words is "three hundred ninety-seven million, five hundred thirty-one thousand, eight hundred".