2540739 has 4 divisors (see below), whose sum is σ = 3387656. Its totient is φ = 1693824.

The previous prime is 2540723. The next prime is 2540743. The reversal of 2540739 is 9370452.

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

It is not a de Polignac number, because 2540739 - 2⁴ = 2540723 is a prime.

It is a super-2 number, since 2×2540739² = 12910709332242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540749) 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, 423454 + ... + 423459.

It is an arithmetic number, because the mean of its divisors is an integer number (846914).

2^2540739 is an apocalyptic number.

2540739 is a deficient number, since it is larger than the sum of its proper divisors (846917).

2540739 is an equidigital number, since it uses as much as digits as its factorization.

2540739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846916.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 2540739 is about 1593.9695731099. The cubic root of 2540739 is about 136.4541299536.

The spelling of 2540739 in words is "two million, five hundred forty thousand, seven hundred thirty-nine".