2539440 has 60 divisors (see below), whose sum is σ = 8530704. Its totient is φ = 676992.

The previous prime is 2539429. The next prime is 2539441. The reversal of 2539440 is 449352.

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2539441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1044 + ... + 2483.

2^2539440 is an apocalyptic number.

2539440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2539440 is an abundant number, since it is smaller than the sum of its proper divisors (5991264).

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

2539440 is a wasteful number, since it uses less digits than its factorization.

2539440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2539440 is about 1593.5620477408. The cubic root of 2539440 is about 136.4308710866.

The spelling of 2539440 in words is "two million, five hundred thirty-nine thousand, four hundred forty".