1999872 has 132 divisors (see below), whose sum is σ = 6812416. Its totient is φ = 552960.

The previous prime is 1999871. The next prime is 1999889. The reversal of 1999872 is 2789991.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1999871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64497 + ... + 64527.

2^1999872 is an apocalyptic number.

1999872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3406208).

1999872 is an abundant number, since it is smaller than the sum of its proper divisors (4812544).

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

1999872 is a wasteful number, since it uses less digits than its factorization.

1999872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 43 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1999872 is about 1414.1683068150. The cubic root of 1999872 is about 125.9894171006.

The spelling of 1999872 in words is "one million, nine hundred ninety-nine thousand, eight hundred seventy-two".