1999388 has 12 divisors (see below), whose sum is σ = 3518592. Its totient is φ = 994080.

The previous prime is 1999379. The next prime is 1999423. The reversal of 1999388 is 8839991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (293216).

2^1999388 is an apocalyptic number.

It is an amenable number.

1999388 is a deficient number, since it is larger than the sum of its proper divisors (1519204).

1999388 is a wasteful number, since it uses less digits than its factorization.

1999388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812 (or 2810 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 1999388 is about 1413.9971711429. The cubic root of 1999388 is about 125.9792524837.

The spelling of 1999388 in words is "one million, nine hundred ninety-nine thousand, three hundred eighty-eight".