397889316 has 72 divisors (see below), whose sum is σ = 1100736000. Its totient is φ = 120185280.

The previous prime is 397889293. The next prime is 397889341. The reversal of 397889316 is 613988793.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136765 + ... + 139643.

It is an arithmetic number, because the mean of its divisors is an integer number (15288000).

Almost surely, 2^397889316 is an apocalyptic number.

397889316 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 397889316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550368000).

397889316 is an abundant number, since it is smaller than the sum of its proper divisors (702846684).

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

397889316 is a wasteful number, since it uses less digits than its factorization.

397889316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249 (or 3244 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 397889316 is about 19947.1631065673. The cubic root of 397889316 is about 735.5080424777.

The spelling of 397889316 in words is "three hundred ninety-seven million, eight hundred eighty-nine thousand, three hundred sixteen".