2749138639 has 4 divisors (see below), whose sum is σ = 2960610856. Its totient is φ = 2537666424.

The previous prime is 2749138627. The next prime is 2749138649. The reversal of 2749138639 is 9368319472.

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 2749138639 - 2¹⁷ = 2749007567 is a prime.

It is a super-3 number, since 3×2749138639³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2749138649) 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, 105736089 + ... + 105736114.

It is an arithmetic number, because the mean of its divisors is an integer number (740152714).

Almost surely, 2^2749138639 is an apocalyptic number.

2749138639 is a deficient number, since it is larger than the sum of its proper divisors (211472217).

2749138639 is a wasteful number, since it uses less digits than its factorization.

2749138639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211472216.

The product of its digits is 1959552, while the sum is 52.

The square root of 2749138639 is about 52432.2290104092. The cubic root of 2749138639 is about 1400.8733732405.

The spelling of 2749138639 in words is "two billion, seven hundred forty-nine million, one hundred thirty-eight thousand, six hundred thirty-nine".