2194639 has 2 divisors, whose sum is σ = 2194640. Its totient is φ = 2194638.

The previous prime is 2194631. The next prime is 2194663. The reversal of 2194639 is 9364912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2194639 - 2³ = 2194631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2194631) 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, 1097319 + 1097320.

It is an arithmetic number, because the mean of its divisors is an integer number (1097320).

2^2194639 is an apocalyptic number.

2194639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194639 is an equidigital number, since it uses as much as digits as its factorization.

2194639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 2194639 is about 1481.4314023943. The cubic root of 2194639 is about 129.9534152613.

The spelling of 2194639 in words is "two million, one hundred ninety-four thousand, six hundred thirty-nine".