2539640 has 32 divisors (see below), whose sum is σ = 5762880. Its totient is φ = 1007232.

The previous prime is 2539639. The next prime is 2539651. The reversal of 2539640 is 469352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6737 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (180090).

2^2539640 is an apocalyptic number.

2539640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2539640 is an abundant number, since it is smaller than the sum of its proper divisors (3223240).

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

2539640 is a wasteful number, since it uses less digits than its factorization.

2539640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 2539640 is about 1593.6247990038. The cubic root of 2539640 is about 136.4344526450.

The spelling of 2539640 in words is "two million, five hundred thirty-nine thousand, six hundred forty".