397305216 has 256 divisors, whose sum is σ = 1462924800. Its totient is φ = 103127040.

The previous prime is 397305187. The next prime is 397305221. The reversal of 397305216 is 612503793.

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 31 ways as a sum of consecutive naturals, for example, 265366 + ... + 266858.

It is an arithmetic number, because the mean of its divisors is an integer number (5714550).

Almost surely, 2^397305216 is an apocalyptic number.

397305216 is a gapful number since it is divisible by the number (36) 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 397305216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731462400).

397305216 is an abundant number, since it is smaller than the sum of its proper divisors (1065619584).

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

397305216 is a wasteful number, since it uses less digits than its factorization.

397305216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 397305216 is about 19932.5165495980. The cubic root of 397305216 is about 735.1479585515.

The spelling of 397305216 in words is "three hundred ninety-seven million, three hundred five thousand, two hundred sixteen".