1999444 has 12 divisors (see below), whose sum is σ = 3512404. Its totient is φ = 995904.

The previous prime is 1999441. The next prime is 1999471. The reversal of 1999444 is 4449991.

It can be written as a sum of positive squares in 2 ways, for example, as 144400 + 1855044 = 380^2 + 1362^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1999397 and 1999406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454 + ... + 2050.

2^1999444 is an apocalyptic number.

It is an amenable number.

1999444 is a deficient number, since it is larger than the sum of its proper divisors (1512960).

1999444 is a wasteful number, since it uses less digits than its factorization.

1999444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914 (or 1912 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 1999444 is about 1414.0169730240. The cubic root of 1999444 is about 125.9804286390.

The spelling of 1999444 in words is "one million, nine hundred ninety-nine thousand, four hundred forty-four".