1999424 has 28 divisors (see below), whose sum is σ = 4535424. Its totient is φ = 856704.

The previous prime is 1999423. The next prime is 1999441. The reversal of 1999424 is 4249991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is an Ulam number.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1999423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 2679.

2^1999424 is an apocalyptic number.

1999424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1999424 is an abundant number, since it is smaller than the sum of its proper divisors (2536000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999424 is an equidigital number, since it uses as much as digits as its factorization.

1999424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482 (or 4472 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 1999424 is about 1414.0099009554. The cubic root of 1999424 is about 125.9800085861.

The spelling of 1999424 in words is "one million, nine hundred ninety-nine thousand, four hundred twenty-four".