1622209 has 2 divisors, whose sum is σ = 1622210. Its totient is φ = 1622208.

The previous prime is 1622207. The next prime is 1622233. The reversal of 1622209 is 9022261.

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., 1617984 + 4225 = 1272^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622209 - 2¹ = 1622207 is a prime.

Together with 1622207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1622209.

It is not a weakly prime, because it can be changed into another prime (1622207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811104 + 811105.

It is an arithmetic number, because the mean of its divisors is an integer number (811105).

2^1622209 is an apocalyptic number.

It is an amenable number.

1622209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622209 is an equidigital number, since it uses as much as digits as its factorization.

1622209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1622209 is about 1273.6596876717. The cubic root of 1622209 is about 117.4993873516.

The spelling of 1622209 in words is "one million, six hundred twenty-two thousand, two hundred nine".