2778243 has 8 divisors (see below), whose sum is σ = 3989328. Its totient is φ = 1709664.

The previous prime is 2778241. The next prime is 2778257. The reversal of 2778243 is 3428772.

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

It is not a de Polignac number, because 2778243 - 2¹ = 2778241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2778241) 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, 35580 + ... + 35657.

It is an arithmetic number, because the mean of its divisors is an integer number (498666).

2^2778243 is an apocalyptic number.

2778243 is a deficient number, since it is larger than the sum of its proper divisors (1211085).

2778243 is a wasteful number, since it uses less digits than its factorization.

2778243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71253.

The product of its digits is 18816, while the sum is 33.

The square root of 2778243 is about 1666.8062274902. The cubic root of 2778243 is about 140.5799581179.

The spelling of 2778243 in words is "two million, seven hundred seventy-eight thousand, two hundred forty-three".