2645409 has 16 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 1571136.

The previous prime is 2645399. The next prime is 2645413. The reversal of 2645409 is 9045462.

It is not a de Polignac number, because 2645409 - 2⁴ = 2645393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645429) 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, 39 + ... + 2300.

It is an arithmetic number, because the mean of its divisors is an integer number (245700).

2^2645409 is an apocalyptic number.

2645409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2645409 is a deficient number, since it is larger than the sum of its proper divisors (1285791).

2645409 is a wasteful number, since it uses less digits than its factorization.

2645409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 2645409 is about 1626.4713339005. The cubic root of 2645409 is about 138.3027903085.

The spelling of 2645409 in words is "two million, six hundred forty-five thousand, four hundred nine".