2638881 has 12 divisors (see below), whose sum is σ = 4356352. Its totient is φ = 1507896.

The previous prime is 2638879. The next prime is 2638897. The reversal of 2638881 is 1888362.

It is not a de Polignac number, because 2638881 - 2¹ = 2638879 is a prime.

It is a super-2 number, since 2×2638881² = 13927385864322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20881 + ... + 21006.

2^2638881 is an apocalyptic number.

2638881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2638881 is a deficient number, since it is larger than the sum of its proper divisors (1717471).

2638881 is a wasteful number, since it uses less digits than its factorization.

2638881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41900 (or 41897 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 2638881 is about 1624.4632959842. The cubic root of 2638881 is about 138.1889346598.

The spelling of 2638881 in words is "two million, six hundred thirty-eight thousand, eight hundred eighty-one".