2637981 has 16 divisors (see below), whose sum is σ = 4005120. Its totient is φ = 1715040.

The previous prime is 2637961. The next prime is 2637983. The reversal of 2637981 is 1897362.

It is not a de Polignac number, because 2637981 - 2⁹ = 2637469 is a prime.

It is a super-2 number, since 2×2637981² = 13917887512722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2637983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85 + ... + 2298.

It is an arithmetic number, because the mean of its divisors is an integer number (250320).

2^2637981 is an apocalyptic number.

It is an amenable number.

2637981 is a deficient number, since it is larger than the sum of its proper divisors (1367139).

2637981 is a wasteful number, since it uses less digits than its factorization.

2637981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2427 counting only the distinct ones).

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

The square root of 2637981 is about 1624.1862577919. The cubic root of 2637981 is about 138.1732229266.

The spelling of 2637981 in words is "two million, six hundred thirty-seven thousand, nine hundred eighty-one".