2778873 has 8 divisors (see below), whose sum is σ = 3714048. Its totient is φ = 1848144.

The previous prime is 2778863. The next prime is 2778877. The reversal of 2778873 is 3788772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2778873 - 2¹² = 2774777 is a prime.

It is an Ulam number.

2778873 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2778877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840 + ... + 2502.

It is an arithmetic number, because the mean of its divisors is an integer number (464256).

2^2778873 is an apocalyptic number.

It is an amenable number.

2778873 is a deficient number, since it is larger than the sum of its proper divisors (935175).

2778873 is a wasteful number, since it uses less digits than its factorization.

2778873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223.

The product of its digits is 131712, while the sum is 42.

The square root of 2778873 is about 1666.9952009529. The cubic root of 2778873 is about 140.5905833800.

The spelling of 2778873 in words is "two million, seven hundred seventy-eight thousand, eight hundred seventy-three".