2645439 has 4 divisors (see below), whose sum is σ = 3527256. Its totient is φ = 1763624.

The previous prime is 2645431. The next prime is 2645453. The reversal of 2645439 is 9345462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2645439 - 2³ = 2645431 is a prime.

It is a D-number.

2645439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645431) 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, 440904 + ... + 440909.

It is an arithmetic number, because the mean of its divisors is an integer number (881814).

2^2645439 is an apocalyptic number.

2645439 is a deficient number, since it is larger than the sum of its proper divisors (881817).

2645439 is an equidigital number, since it uses as much as digits as its factorization.

2645439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881816.

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

The square root of 2645439 is about 1626.4805562933. The cubic root of 2645439 is about 138.3033131095.

The spelling of 2645439 in words is "two million, six hundred forty-five thousand, four hundred thirty-nine".