2189639 has 2 divisors, whose sum is σ = 2189640. Its totient is φ = 2189638.

The previous prime is 2189633. The next prime is 2189647. The reversal of 2189639 is 9369812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2189639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094819 + 1094820.

It is an arithmetic number, because the mean of its divisors is an integer number (1094820).

2^2189639 is an apocalyptic number.

2189639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189639 is an equidigital number, since it uses as much as digits as its factorization.

2189639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 2189639 is about 1479.7428830712. The cubic root of 2189639 is about 129.8546501717.

The spelling of 2189639 in words is "two million, one hundred eighty-nine thousand, six hundred thirty-nine".