1423819 has 2 divisors, whose sum is σ = 1423820. Its totient is φ = 1423818.

The previous prime is 1423789. The next prime is 1423843. The reversal of 1423819 is 9183241.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9183241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1423819 - 2⁷ = 1423691 is a prime.

It is a super-2 number, since 2×1423819² = 4054521089522, which contains 22 as substring.

It is equal to p₁₀₈₇₅₇ and since 1423819 and 108757 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 (1423319) 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 as a sum of consecutive naturals, namely, 711909 + 711910.

It is an arithmetic number, because the mean of its divisors is an integer number (711910).

2^1423819 is an apocalyptic number.

1423819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423819 is an equidigital number, since it uses as much as digits as its factorization.

1423819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 1423819 is about 1193.2388696317. The cubic root of 1423819 is about 112.4997596703.

The spelling of 1423819 in words is "one million, four hundred twenty-three thousand, eight hundred nineteen".