2540039 has 4 divisors (see below), whose sum is σ = 2544024. Its totient is φ = 2536056.

The previous prime is 2540033. The next prime is 2540071. The reversal of 2540039 is 9300452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2539996 and 2540023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540033) 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, 797 + ... + 2390.

It is an arithmetic number, because the mean of its divisors is an integer number (636006).

2^2540039 is an apocalyptic number.

2540039 is a deficient number, since it is larger than the sum of its proper divisors (3985).

2540039 is an equidigital number, since it uses as much as digits as its factorization.

2540039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2540039 is about 1593.7499803922. The cubic root of 2540039 is about 136.4415972922.

The spelling of 2540039 in words is "two million, five hundred forty thousand, thirty-nine".