2782391 has 2 divisors, whose sum is σ = 2782392. Its totient is φ = 2782390.

The previous prime is 2782361. The next prime is 2782397. The reversal of 2782391 is 1932872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2782391 - 2¹⁴ = 2766007 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2782397) 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 as a sum of consecutive naturals, namely, 1391195 + 1391196.

It is an arithmetic number, because the mean of its divisors is an integer number (1391196).

2^2782391 is an apocalyptic number.

2782391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782391 is an equidigital number, since it uses as much as digits as its factorization.

2782391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 2782391 is about 1668.0500592009. The cubic root of 2782391 is about 140.6498866901.

The spelling of 2782391 in words is "two million, seven hundred eighty-two thousand, three hundred ninety-one".