2781003 has 4 divisors (see below), whose sum is σ = 3708008. Its totient is φ = 1854000.

The previous prime is 2781001. The next prime is 2781007. The reversal of 2781003 is 3001872.

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

It is not a de Polignac number, because 2781003 - 2¹ = 2781001 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781001) 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 3 ways as a sum of consecutive naturals, for example, 463498 + ... + 463503.

It is an arithmetic number, because the mean of its divisors is an integer number (927002).

2^2781003 is an apocalyptic number.

2781003 is a deficient number, since it is larger than the sum of its proper divisors (927005).

2781003 is an equidigital number, since it uses as much as digits as its factorization.

2781003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927004.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2781003 is about 1667.6339526407. The cubic root of 2781003 is about 140.6264949965.

Adding to 2781003 its reverse (3001872), we get a palindrome (5782875).

The spelling of 2781003 in words is "two million, seven hundred eighty-one thousand, three".