2609405 has 4 divisors (see below), whose sum is σ = 3131292. Its totient is φ = 2087520.

The previous prime is 2609401. The next prime is 2609407. The reversal of 2609405 is 5049062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5049062 = 2 ⋅2524531.

It can be written as a sum of positive squares in 2 ways, for example, as 1907161 + 702244 = 1381^2 + 838^2 .

It is not a de Polignac number, because 2609405 - 2² = 2609401 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 (2609401) 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, 260936 + ... + 260945.

It is an arithmetic number, because the mean of its divisors is an integer number (782823).

2^2609405 is an apocalyptic number.

It is an amenable number.

2609405 is a deficient number, since it is larger than the sum of its proper divisors (521887).

2609405 is an equidigital number, since it uses as much as digits as its factorization.

2609405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521886.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2609405 is about 1615.3652837671. The cubic root of 2609405 is about 137.6724887628.

The spelling of 2609405 in words is "two million, six hundred nine thousand, four hundred five".