2540721 has 8 divisors (see below), whose sum is σ = 3422944. Its totient is φ = 1676160.

The previous prime is 2540693. The next prime is 2540723. The reversal of 2540721 is 1270452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2540721 - 2⁵ = 2540689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075 + ... + 4656.

It is an arithmetic number, because the mean of its divisors is an integer number (427868).

2^2540721 is an apocalyptic number.

It is an amenable number.

2540721 is a deficient number, since it is larger than the sum of its proper divisors (882223).

2540721 is an equidigital number, since it uses as much as digits as its factorization.

2540721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 2540721 is about 1593.9639268189. The cubic root of 2540721 is about 136.4538077140.

The spelling of 2540721 in words is "two million, five hundred forty thousand, seven hundred twenty-one".