2540621 has 4 divisors (see below), whose sum is σ = 2549052. Its totient is φ = 2532192.

The previous prime is 2540617. The next prime is 2540627. The reversal of 2540621 is 1260452.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 1562500 = 989^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540621 - 2² = 2540617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2540593 and 2540602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540627) 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, 3746 + ... + 4371.

It is an arithmetic number, because the mean of its divisors is an integer number (637263).

2^2540621 is an apocalyptic number.

It is an amenable number.

2540621 is a deficient number, since it is larger than the sum of its proper divisors (8431).

2540621 is an equidigital number, since it uses as much as digits as its factorization.

2540621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8430.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2540621 is about 1593.9325581718. The cubic root of 2540621 is about 136.4520174663.

The spelling of 2540621 in words is "two million, five hundred forty thousand, six hundred twenty-one".