2749443921 has 24 divisors (see below), whose sum is σ = 4557622784. Its totient is φ = 1564583040.

The previous prime is 2749443883. The next prime is 2749443941. The reversal of 2749443921 is 1293449472.

2749443921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2749443921 - 2⁶ = 2749443857 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2749443941) 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, 75361 + ... + 105726.

Almost surely, 2^2749443921 is an apocalyptic number.

2749443921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2749443921 is a deficient number, since it is larger than the sum of its proper divisors (1808178863).

2749443921 is a wasteful number, since it uses less digits than its factorization.

2749443921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181341 (or 181338 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 2749443921 is about 52435.1401352185. The cubic root of 2749443921 is about 1400.9252253116.

The spelling of 2749443921 in words is "two billion, seven hundred forty-nine million, four hundred forty-three thousand, nine hundred twenty-one".