2745639 has 24 divisors (see below), whose sum is σ = 4414592. Its totient is φ = 1632960.

The previous prime is 2745637. The next prime is 2745643. The reversal of 2745639 is 9365472.

It is not a de Polignac number, because 2745639 - 2¹ = 2745637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3249 + ... + 4005.

2^2745639 is an apocalyptic number.

2745639 is a deficient number, since it is larger than the sum of its proper divisors (1668953).

2745639 is a wasteful number, since it uses less digits than its factorization.

2745639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 804 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 2745639 is about 1656.9969824957. The cubic root of 2745639 is about 140.0278686017.

It can be divided in two parts, 27456 and 39, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 2745639 in words is "two million, seven hundred forty-five thousand, six hundred thirty-nine".