2638540 has 12 divisors (see below), whose sum is σ = 5540976. Its totient is φ = 1055408.

The previous prime is 2638529. The next prime is 2638543. The reversal of 2638540 is 458362.

It is a junction number, because it is equal to n+sod(n) for n = 2638499 and 2638508.

It is not an unprimeable number, because it can be changed into a prime (2638543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65944 + ... + 65983.

It is an arithmetic number, because the mean of its divisors is an integer number (461748).

2^2638540 is an apocalyptic number.

2638540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638540 is an abundant number, since it is smaller than the sum of its proper divisors (2902436).

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

2638540 is a wasteful number, since it uses less digits than its factorization.

2638540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131936 (or 131934 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 2638540 is about 1624.3583348510. The cubic root of 2638540 is about 138.1829820791.

The spelling of 2638540 in words is "two million, six hundred thirty-eight thousand, five hundred forty".