2749440 has 88 divisors (see below), whose sum is σ = 8843040. Its totient is φ = 729088.

The previous prime is 2749391. The next prime is 2749441. The reversal of 2749440 is 449472.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2749398 and 2749407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2749441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15271 + ... + 15449.

2^2749440 is an apocalyptic number.

2749440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2749440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4421520).

2749440 is an abundant number, since it is smaller than the sum of its proper divisors (6093600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2749440 is a wasteful number, since it uses less digits than its factorization.

2749440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 2749440 is about 1658.1435402280. The cubic root of 2749440 is about 140.0924559355.

Subtracting from 2749440 its reverse (449472), we obtain a cube (2299968 = 132³).

The spelling of 2749440 in words is "two million, seven hundred forty-nine thousand, four hundred forty".