2781993 has 16 divisors (see below), whose sum is σ = 3874176. Its totient is φ = 1774080.

The previous prime is 2781991. The next prime is 2782001. The reversal of 2781993 is 3991872.

2781993 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 2781993 - 2¹ = 2781991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2781991) 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 15 ways as a sum of consecutive naturals, for example, 7705 + ... + 8057.

It is an arithmetic number, because the mean of its divisors is an integer number (242136).

2^2781993 is an apocalyptic number.

It is an amenable number.

2781993 is a deficient number, since it is larger than the sum of its proper divisors (1092183).

2781993 is a wasteful number, since it uses less digits than its factorization.

2781993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its digits is 27216, while the sum is 39.

The square root of 2781993 is about 1667.9307539583. The cubic root of 2781993 is about 140.6431800693.

The spelling of 2781993 in words is "two million, seven hundred eighty-one thousand, nine hundred ninety-three".