397842916 has 9 divisors (see below), whose sum is σ = 696294921. Its totient is φ = 198901512.

The previous prime is 397842911. The next prime is 397842917. The reversal of 397842916 is 619248793.

The square root of 397842916 is 19946.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 48302500 + 349540416 = 6950^2 + 18696^2 .

It is a super-2 number, since 2×397842916² = 316557971622766112, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397842916.

It is not an unprimeable number, because it can be changed into a prime (397842911) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 34906 + ... + 44878.

Almost surely, 2^397842916 is an apocalyptic number.

397842916 is the 19946-th square number.

It is an amenable number.

397842916 is a deficient number, since it is larger than the sum of its proper divisors (298452005).

397842916 is an frugal number, since it uses more digits than its factorization.

397842916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19950 (or 9975 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The cubic root of 397842916 is about 735.4794508582.

Multiplying 397842916 by its sum of digits (49), we get a square (19494302884 = 139622²).

The spelling of 397842916 in words is "three hundred ninety-seven million, eight hundred forty-two thousand, nine hundred sixteen".