2748639 has 4 divisors (see below), whose sum is σ = 3664856. Its totient is φ = 1832424.

The previous prime is 2748617. The next prime is 2748643. The reversal of 2748639 is 9368472.

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

It is not a de Polignac number, because 2748639 - 2¹² = 2744543 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2748597 and 2748606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2748659) 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, 458104 + ... + 458109.

It is an arithmetic number, because the mean of its divisors is an integer number (916214).

2^2748639 is an apocalyptic number.

2748639 is a deficient number, since it is larger than the sum of its proper divisors (916217).

2748639 is an equidigital number, since it uses as much as digits as its factorization.

2748639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916216.

The product of its digits is 72576, while the sum is 39.

The square root of 2748639 is about 1657.9019874528. The cubic root of 2748639 is about 140.0788501399.

The spelling of 2748639 in words is "two million, seven hundred forty-eight thousand, six hundred thirty-nine".