2189989 has 2 divisors, whose sum is σ = 2189990. Its totient is φ = 2189988.

The previous prime is 2189987. The next prime is 2190017. The reversal of 2189989 is 9899812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361889 + 828100 = 1167^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189989 - 2¹ = 2189987 is a prime.

Together with 2189987, it forms a pair of twin primes.

2189989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094994 + 1094995.

It is an arithmetic number, because the mean of its divisors is an integer number (1094995).

2^2189989 is an apocalyptic number.

It is an amenable number.

2189989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189989 is an equidigital number, since it uses as much as digits as its factorization.

2189989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 46.

The square root of 2189989 is about 1479.8611421346. The cubic root of 2189989 is about 129.8615686191.

The spelling of 2189989 in words is "two million, one hundred eighty-nine thousand, nine hundred eighty-nine".