2539840 has 28 divisors (see below), whose sum is σ = 6048756. Its totient is φ = 1015808.

The previous prime is 2539829. The next prime is 2539841. The reversal of 2539840 is 489352.

It can be written as a sum of positive squares in 2 ways, for example, as 1937664 + 602176 = 1392^2 + 776^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2539841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3649 + ... + 4288.

It is an arithmetic number, because the mean of its divisors is an integer number (216027).

2^2539840 is an apocalyptic number.

2539840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2539840 is an abundant number, since it is smaller than the sum of its proper divisors (3508916).

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

2539840 is an equidigital number, since it uses as much as digits as its factorization.

2539840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7954 (or 7944 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2539840 is about 1593.6875477960. The cubic root of 2539840 is about 136.4380340153.

The spelling of 2539840 in words is "two million, five hundred thirty-nine thousand, eight hundred forty".