2781802 has 4 divisors (see below), whose sum is σ = 4172706. Its totient is φ = 1390900.

The previous prime is 2781797. The next prime is 2781803. The reversal of 2781802 is 2081872.

2781802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 95481 = 1639^2 + 309^2 .

It is not an unprimeable number, because it can be changed into a prime (2781803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695449 + ... + 695452.

2^2781802 is an apocalyptic number.

2781802 is a deficient number, since it is larger than the sum of its proper divisors (1390904).

2781802 is a wasteful number, since it uses less digits than its factorization.

2781802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390903.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2781802 is about 1667.8734964019. The cubic root of 2781802 is about 140.6399613382.

It can be divided in two parts, 278 and 1802, that added together give a triangular number (2080 = T₆₄).

The spelling of 2781802 in words is "two million, seven hundred eighty-one thousand, eight hundred two".