2539621 has 6 divisors (see below), whose sum is σ = 2954310. Its totient is φ = 2176776.

The previous prime is 2539583. The next prime is 2539627. The reversal of 2539621 is 1269352.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 540225 = 1414^2 + 735^2 .

It is not a de Polignac number, because 2539621 - 2²¹ = 442469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2539621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2539627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25866 + ... + 25963.

It is an arithmetic number, because the mean of its divisors is an integer number (492385).

2^2539621 is an apocalyptic number.

It is an amenable number.

2539621 is a deficient number, since it is larger than the sum of its proper divisors (414689).

2539621 is an equidigital number, since it uses as much as digits as its factorization.

2539621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51843 (or 51836 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 2539621 is about 1593.6188377401. The cubic root of 2539621 is about 136.4341124050.

It can be divided in two parts, 2539 and 621, that added together give a triangular number (3160 = T₇₉).

The spelling of 2539621 in words is "two million, five hundred thirty-nine thousand, six hundred twenty-one".