397135872 has 364 divisors, whose sum is σ = 1432442080. Its totient is φ = 107495424.

The previous prime is 397135813. The next prime is 397135883. The reversal of 397135872 is 278531793.

It is a happy number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 20901879 + ... + 20901897.

Almost surely, 2^397135872 is an apocalyptic number.

397135872 is a gapful number since it is divisible by the number (32) 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 397135872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (716221040).

397135872 is an abundant number, since it is smaller than the sum of its proper divisors (1035306208).

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

397135872 is an frugal number, since it uses more digits than its factorization.

397135872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 31 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 397135872 is about 19928.2681635911. The cubic root of 397135872 is about 735.0434959682.

The spelling of 397135872 in words is "three hundred ninety-seven million, one hundred thirty-five thousand, eight hundred seventy-two".