2539638 has 24 divisors (see below), whose sum is σ = 5538000. Its totient is φ = 841104.

The previous prime is 2539633. The next prime is 2539639. The reversal of 2539638 is 8369352.

It is a super-2 number, since 2×2539638² = 12899522342088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2539631) 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, 3228 + ... + 3936.

It is an arithmetic number, because the mean of its divisors is an integer number (230750).

2^2539638 is an apocalyptic number.

2539638 is an abundant number, since it is smaller than the sum of its proper divisors (2998362).

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

2539638 is a wasteful number, since it uses less digits than its factorization.

2539638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 913 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 2539638 is about 1593.6241715034. The cubic root of 2539638 is about 136.4344168303.

The spelling of 2539638 in words is "two million, five hundred thirty-nine thousand, six hundred thirty-eight".