2397681 has 56 divisors (see below), whose sum is σ = 4406976. Its totient is φ = 1283040.

The previous prime is 2397677. The next prime is 2397683. The reversal of 2397681 is 1867932.

2397681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2397681 - 2² = 2397677 is a prime.

It is a super-2 number, since 2×2397681² = 11497748355522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2397683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 104236 + ... + 104258.

It is an arithmetic number, because the mean of its divisors is an integer number (78696).

2^2397681 is an apocalyptic number.

It is an amenable number.

2397681 is a deficient number, since it is larger than the sum of its proper divisors (2009295).

2397681 is a wasteful number, since it uses less digits than its factorization.

2397681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 50 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 2397681 is about 1548.4447035655. Note that the first 3 decimals coincide. The cubic root of 2397681 is about 133.8434534807.

The spelling of 2397681 in words is "two million, three hundred ninety-seven thousand, six hundred eighty-one".