1999218 has 48 divisors (see below), whose sum is σ = 4608576. Its totient is φ = 574560.

The previous prime is 1999211. The next prime is 1999219. The reversal of 1999218 is 8129991.

It is a happy number.

It is a super-2 number, since 2×1999218² = 7993745223048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (11664) is a multiple of the sum of its prime divisors (108).

It is not an unprimeable number, because it can be changed into a prime (1999211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28123 + ... + 28193.

It is an arithmetic number, because the mean of its divisors is an integer number (96012).

2^1999218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2304288).

1999218 is an abundant number, since it is smaller than the sum of its proper divisors (2609358).

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

1999218 is a wasteful number, since it uses less digits than its factorization.

1999218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 108 counting only the distinct ones).

The product of its digits is 11664, while the sum is 39.

The square root of 1999218 is about 1413.9370565906. The cubic root of 1999218 is about 125.9756818778.

The spelling of 1999218 in words is "one million, nine hundred ninety-nine thousand, two hundred eighteen".