1999438 has 32 divisors (see below), whose sum is σ = 3760128. Its totient is φ = 777600.

The previous prime is 1999423. The next prime is 1999441. The reversal of 1999438 is 8349991.

It is a zygodrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1999394 and 1999403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7243 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (117504).

2^1999438 is an apocalyptic number.

1999438 is a deficient number, since it is larger than the sum of its proper divisors (1760690).

1999438 is a wasteful number, since it uses less digits than its factorization.

1999438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328.

The product of its digits is 69984, while the sum is 43.

The square root of 1999438 is about 1414.0148514072. The cubic root of 1999438 is about 125.9803026234.

The spelling of 1999438 in words is "one million, nine hundred ninety-nine thousand, four hundred thirty-eight".