1999008 has 72 divisors (see below), whose sum is σ = 6211296. Its totient is φ = 604800.

The previous prime is 1999007. The next prime is 1999021. The reversal of 1999008 is 8009991.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1999007) 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 11 ways as a sum of consecutive naturals, for example, 2853 + ... + 3483.

It is an arithmetic number, because the mean of its divisors is an integer number (86268).

2^1999008 is an apocalyptic number.

1999008 is a gapful number since it is divisible by the number (18) 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 1999008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3105648).

1999008 is an abundant number, since it is smaller than the sum of its proper divisors (4212288).

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

1999008 is a wasteful number, since it uses less digits than its factorization.

1999008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1999008 is about 1413.8627939089. The cubic root of 1999008 is about 125.9712708498.

The spelling of 1999008 in words is "one million, nine hundred ninety-nine thousand, eight".