2781286 has 4 divisors (see below), whose sum is σ = 4171932. Its totient is φ = 1390642.

The previous prime is 2781271. The next prime is 2781293. The reversal of 2781286 is 6821872.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695320 + ... + 695323.

It is an arithmetic number, because the mean of its divisors is an integer number (1042983).

2^2781286 is an apocalyptic number.

2781286 is a deficient number, since it is larger than the sum of its proper divisors (1390646).

2781286 is a wasteful number, since it uses less digits than its factorization.

2781286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390645.

The product of its digits is 10752, while the sum is 34.

The square root of 2781286 is about 1667.7188012372. The cubic root of 2781286 is about 140.6312649719.

The spelling of 2781286 in words is "two million, seven hundred eighty-one thousand, two hundred eighty-six".