2773840 has 20 divisors (see below), whose sum is σ = 6449364. Its totient is φ = 1109504.

The previous prime is 2773819. The next prime is 2773843. The reversal of 2773840 is 483772.

It can be written as a sum of positive squares in 2 ways, for example, as 535824 + 2238016 = 732^2 + 1496^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2773843) 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, 17257 + ... + 17416.

2^2773840 is an apocalyptic number.

2773840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2773840 is an abundant number, since it is smaller than the sum of its proper divisors (3675524).

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

2773840 is a wasteful number, since it uses less digits than its factorization.

2773840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34686 (or 34680 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 2773840 is about 1665.4849143718. The cubic root of 2773840 is about 140.5056544627.

The spelling of 2773840 in words is "two million, seven hundred seventy-three thousand, eight hundred forty".