1999423 has 2 divisors, whose sum is σ = 1999424. Its totient is φ = 1999422.

The previous prime is 1999379. The next prime is 1999441. The reversal of 1999423 is 3249991.

It is a strong prime.

It is an emirp because it is prime and its reverse (3249991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999423 is a prime.

1999423 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999711 + 999712.

It is an arithmetic number, because the mean of its divisors is an integer number (999712).

2^1999423 is an apocalyptic number.

1999423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999423 is an equidigital number, since it uses as much as digits as its factorization.

1999423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 1999423 is about 1414.0095473511. The cubic root of 1999423 is about 125.9799875834.

The spelling of 1999423 in words is "one million, nine hundred ninety-nine thousand, four hundred twenty-three".