1922209 has 2 divisors, whose sum is σ = 1922210. Its totient is φ = 1922208.

The previous prime is 1922153. The next prime is 1922213. The reversal of 1922209 is 9022291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 705600 = 1103^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1922209 - 2¹¹ = 1920161 is a prime.

It is equal to p₁₄₃₅₆₆ and since 1922209 and 143566 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1922269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 961104 + 961105.

It is an arithmetic number, because the mean of its divisors is an integer number (961105).

2^1922209 is an apocalyptic number.

It is an amenable number.

1922209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1922209 is an equidigital number, since it uses as much as digits as its factorization.

1922209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1922209 is about 1386.4375211310. The cubic root of 1922209 is about 124.3369477794.

It can be divided in two parts, 192 and 2209, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1922209 in words is "one million, nine hundred twenty-two thousand, two hundred nine".