2495809 has 4 divisors (see below), whose sum is σ = 2509780. Its totient is φ = 2481840.

The previous prime is 2495807. The next prime is 2495813. The reversal of 2495809 is 9085942.

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 1166400 + 1329409 = 1080^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 2495809 - 2¹ = 2495807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2495803) 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, 6714 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (627445).

2^2495809 is an apocalyptic number.

It is an amenable number.

2495809 is a deficient number, since it is larger than the sum of its proper divisors (13971).

2495809 is a wasteful number, since it uses less digits than its factorization.

2495809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13970.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 2495809 is about 1579.8129636131. The cubic root of 2495809 is about 135.6449975822.

It can be divided in two parts, 249 and 5809, that multiplied together give a palindrome (1446441).

The spelling of 2495809 in words is "two million, four hundred ninety-five thousand, eight hundred nine".