1819423 has 2 divisors, whose sum is σ = 1819424. Its totient is φ = 1819422.

The previous prime is 1819409. The next prime is 1819471. The reversal of 1819423 is 3249181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1819423 is a prime.

1819423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1819391 and 1819400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1819123) 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, 909711 + 909712.

It is an arithmetic number, because the mean of its divisors is an integer number (909712).

2^1819423 is an apocalyptic number.

1819423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819423 is an equidigital number, since it uses as much as digits as its factorization.

1819423 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 1819423 is about 1348.8598889433. The cubic root of 1819423 is about 122.0800111179.

It can be divided in two parts, 181 and 9423, that added together give a square (9604 = 98²).

The spelling of 1819423 in words is "one million, eight hundred nineteen thousand, four hundred twenty-three".