2539809 has 16 divisors (see below), whose sum is σ = 3801600. Its totient is φ = 1675728.

The previous prime is 2539777. The next prime is 2539829. The reversal of 2539809 is 9089352.

It is not a de Polignac number, because 2539809 - 2⁵ = 2539777 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2539829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2512 + ... + 3374.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

2^2539809 is an apocalyptic number.

It is an amenable number.

2539809 is a deficient number, since it is larger than the sum of its proper divisors (1261791).

2539809 is a wasteful number, since it uses less digits than its factorization.

2539809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 2539809 is about 1593.6778218950. The cubic root of 2539809 is about 136.4374789152.

The spelling of 2539809 in words is "two million, five hundred thirty-nine thousand, eight hundred nine".