2445639 has 24 divisors (see below), whose sum is σ = 3852288. Its totient is φ = 1375920.

The previous prime is 2445629. The next prime is 2445647. The reversal of 2445639 is 9365442.

It is not a de Polignac number, because 2445639 - 2²⁰ = 1397063 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 4⁷ + 4⁹ + 5⁵ + 6⁵ + 3¹⁰ + 9 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2445629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18604 + ... + 18734.

It is an arithmetic number, because the mean of its divisors is an integer number (160512).

2^2445639 is an apocalyptic number.

2445639 is a deficient number, since it is larger than the sum of its proper divisors (1406649).

2445639 is a wasteful number, since it uses less digits than its factorization.

2445639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 268 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 2445639 is about 1563.8538934312. The cubic root of 2445639 is about 134.7299402309.

The spelling of 2445639 in words is "two million, four hundred forty-five thousand, six hundred thirty-nine".