1909223 has 2 divisors, whose sum is σ = 1909224. Its totient is φ = 1909222.

The previous prime is 1909217. The next prime is 1909231. The reversal of 1909223 is 3229091.

It is a weak prime.

It is an emirp because it is prime and its reverse (3229091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1909223 - 2⁸ = 1908967 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1909192 and 1909201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954611 + 954612.

It is an arithmetic number, because the mean of its divisors is an integer number (954612).

2^1909223 is an apocalyptic number.

1909223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909223 is an equidigital number, since it uses as much as digits as its factorization.

1909223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1909223 is about 1381.7463587794. The cubic root of 1909223 is about 124.0563176370.

The spelling of 1909223 in words is "one million, nine hundred nine thousand, two hundred twenty-three".