1922009 has 4 divisors (see below), whose sum is σ = 1930704. Its totient is φ = 1913316.

The previous prime is 1921981. The next prime is 1922027. The reversal of 1922009 is 9002291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9002291 = 1747 ⋅5153.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1922009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (1922209) 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 in 3 ways as a sum of consecutive naturals, for example, 4007 + ... + 4460.

It is an arithmetic number, because the mean of its divisors is an integer number (482676).

2^1922009 is an apocalyptic number.

It is an amenable number.

1922009 is a deficient number, since it is larger than the sum of its proper divisors (8695).

1922009 is an equidigital number, since it uses as much as digits as its factorization.

1922009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8694.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1922009 is about 1386.3653919512. The cubic root of 1922009 is about 124.3326353361.

The spelling of 1922009 in words is "one million, nine hundred twenty-two thousand, nine".