1909429 has 2 divisors, whose sum is σ = 1909430. Its totient is φ = 1909428.

The previous prime is 1909421. The next prime is 1909441. The reversal of 1909429 is 9249091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 677329 = 1110^2 + 823^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909429 - 2³ = 1909421 is a prime.

1909429 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1909394 and 1909403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1909421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954714 + 954715.

It is an arithmetic number, because the mean of its divisors is an integer number (954715).

2^1909429 is an apocalyptic number.

It is an amenable number.

1909429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909429 is an equidigital number, since it uses as much as digits as its factorization.

1909429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1909429 is about 1381.8209001169. The cubic root of 1909429 is about 124.0607792569.

The spelling of 1909429 in words is "one million, nine hundred nine thousand, four hundred twenty-nine".