2781963 has 6 divisors (see below), whose sum is σ = 4018404. Its totient is φ = 1854636.

The previous prime is 2781959. The next prime is 2781983. The reversal of 2781963 is 3691872.

2781963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2781963 - 2² = 2781959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2781913) 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 in 5 ways as a sum of consecutive naturals, for example, 154545 + ... + 154562.

It is an arithmetic number, because the mean of its divisors is an integer number (669734).

2^2781963 is an apocalyptic number.

2781963 is a deficient number, since it is larger than the sum of its proper divisors (1236441).

2781963 is a wasteful number, since it uses less digits than its factorization.

2781963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309113 (or 309110 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 2781963 is about 1667.9217607550. The cubic root of 2781963 is about 140.6426745192.

Subtracting 2781963 from its reverse (3691872), we obtain a palindrome (909909).

The spelling of 2781963 in words is "two million, seven hundred eighty-one thousand, nine hundred sixty-three".