2638840 has 32 divisors (see below), whose sum is σ = 6101280. Its totient is φ = 1026432.

The previous prime is 2638793. The next prime is 2638841. The reversal of 2638840 is 488362.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 589 + ... + 2371.

It is an arithmetic number, because the mean of its divisors is an integer number (190665).

2^2638840 is an apocalyptic number.

2638840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2638840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3050640).

2638840 is an abundant number, since it is smaller than the sum of its proper divisors (3462440).

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

2638840 is a wasteful number, since it uses less digits than its factorization.

2638840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831 (or 1827 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 2638840 is about 1624.4506763826. The cubic root of 2638840 is about 138.1882189808.

The spelling of 2638840 in words is "two million, six hundred thirty-eight thousand, eight hundred forty".