397987344 has 140 divisors (see below), whose sum is σ = 1168963500. Its totient is φ = 131196672.

The previous prime is 397987333. The next prime is 397987349. The reversal of 397987344 is 443789793.

It can be written as a sum of positive squares in 2 ways, for example, as 215737344 + 182250000 = 14688^2 + 13500^2 .

It is a super-3 number, since 3×397987344³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (397987349) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1737822 + ... + 1738050.

Almost surely, 2^397987344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397987344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584481750).

397987344 is an abundant number, since it is smaller than the sum of its proper divisors (770976156).

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

397987344 is a wasteful number, since it uses less digits than its factorization.

397987344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 383 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 397987344 is about 19949.6201467597. The cubic root of 397987344 is about 735.5684398958.

The spelling of 397987344 in words is "three hundred ninety-seven million, nine hundred eighty-seven thousand, three hundred forty-four".