2523639 has 4 divisors (see below), whose sum is σ = 3364856. Its totient is φ = 1682424.

The previous prime is 2523593. The next prime is 2523641. The reversal of 2523639 is 9363252.

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

It is not a de Polignac number, because 2523639 - 2¹¹ = 2521591 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523139) 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, 420604 + ... + 420609.

It is an arithmetic number, because the mean of its divisors is an integer number (841214).

2^2523639 is an apocalyptic number.

2523639 is a deficient number, since it is larger than the sum of its proper divisors (841217).

2523639 is an equidigital number, since it uses as much as digits as its factorization.

2523639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841216.

The product of its digits is 9720, while the sum is 30.

The square root of 2523639 is about 1588.5965504180. The cubic root of 2523639 is about 136.1473137014.

The spelling of 2523639 in words is "two million, five hundred twenty-three thousand, six hundred thirty-nine".