1423909 has 2 divisors, whose sum is σ = 1423910. Its totient is φ = 1423908.

The previous prime is 1423901. The next prime is 1423921. The reversal of 1423909 is 9093241.

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., 748225 + 675684 = 865^2 + 822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423909 - 2³ = 1423901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423901) 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, 711954 + 711955.

It is an arithmetic number, because the mean of its divisors is an integer number (711955).

2^1423909 is an apocalyptic number.

It is an amenable number.

1423909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423909 is an equidigital number, since it uses as much as digits as its factorization.

1423909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1423909 is about 1193.2765815183. The cubic root of 1423909 is about 112.5021300008.

It can be divided in two parts, 1423 and 909, that added together give a palindrome (2332).

The spelling of 1423909 in words is "one million, four hundred twenty-three thousand, nine hundred nine".