1982199 has 4 divisors (see below), whose sum is σ = 2642936. Its totient is φ = 1321464.

The previous prime is 1982191. The next prime is 1982203. The reversal of 1982199 is 9912891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9912891 = 3 ⋅3304297.

It is not a de Polignac number, because 1982199 - 2³ = 1982191 is a prime.

It is a super-4 number, since 4×1982199⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

1982199 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330364 + ... + 330369.

It is an arithmetic number, because the mean of its divisors is an integer number (660734).

2^1982199 is an apocalyptic number.

1982199 is a deficient number, since it is larger than the sum of its proper divisors (660737).

1982199 is an equidigital number, since it uses as much as digits as its factorization.

1982199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660736.

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

The square root of 1982199 is about 1407.9058917413. The cubic root of 1982199 is about 125.6171929011.

The spelling of 1982199 in words is "one million, nine hundred eighty-two thousand, one hundred ninety-nine".