2791440 has 60 divisors (see below), whose sum is σ = 9377004. Its totient is φ = 744192.

The previous prime is 2791429. The next prime is 2791463. The reversal of 2791440 is 441972.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 853776 + 1937664 = 924^2 + 1392^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1219 + ... + 2658.

2^2791440 is an apocalyptic number.

2791440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2791440 is an abundant number, since it is smaller than the sum of its proper divisors (6585564).

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

2791440 is a wasteful number, since it uses less digits than its factorization.

2791440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896 (or 3887 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2791440 is about 1670.7603059685. The cubic root of 2791440 is about 140.8021973658.

The spelling of 2791440 in words is "two million, seven hundred ninety-one thousand, four hundred forty".