2781992 has 16 divisors (see below), whose sum is σ = 5237460. Its totient is φ = 1385344.

The previous prime is 2781991. The next prime is 2782001. The reversal of 2781992 is 2991872.

It can be written as a sum of positive squares in 2 ways, for example, as 2390116 + 391876 = 1546^2 + 626^2 .

It is not an unprimeable number, because it can be changed into a prime (2781991) 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, 1988 + ... + 3084.

2^2781992 is an apocalyptic number.

It is an amenable number.

2781992 is a deficient number, since it is larger than the sum of its proper divisors (2455468).

2781992 is a wasteful number, since it uses less digits than its factorization.

2781992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420 (or 1416 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 2781992 is about 1667.9304541857. The cubic root of 2781992 is about 140.6431632177.

It can be divided in two parts, 2781 and 992, that added together give a palindrome (3773).

The spelling of 2781992 in words is "two million, seven hundred eighty-one thousand, nine hundred ninety-two".