2781043 has 4 divisors (see below), whose sum is σ = 2805768. Its totient is φ = 2756320.

The previous prime is 2781029. The next prime is 2781059. The reversal of 2781043 is 3401872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2780999 and 2781017.

It is not an unprimeable number, because it can be changed into a prime (2781073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12193 + ... + 12418.

It is an arithmetic number, because the mean of its divisors is an integer number (701442).

2^2781043 is an apocalyptic number.

2781043 is a deficient number, since it is larger than the sum of its proper divisors (24725).

2781043 is a wasteful number, since it uses less digits than its factorization.

2781043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24724.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 2781043 is about 1667.6459456371. The cubic root of 2781043 is about 140.6271692176.

The spelling of 2781043 in words is "two million, seven hundred eighty-one thousand, forty-three".