1998199 has 4 divisors (see below), whose sum is σ = 2283664. Its totient is φ = 1712736.

The previous prime is 1998181. The next prime is 1998209. The reversal of 1998199 is 9918991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998199 - 2¹³ = 1990007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998109) 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, 142722 + ... + 142735.

It is an arithmetic number, because the mean of its divisors is an integer number (570916).

2^1998199 is an apocalyptic number.

1998199 is a deficient number, since it is larger than the sum of its proper divisors (285465).

1998199 is an equidigital number, since it uses as much as digits as its factorization.

1998199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285464.

The product of its digits is 52488, while the sum is 46.

The square root of 1998199 is about 1413.5766693038. The cubic root of 1998199 is about 125.9542750017.

It can be divided in two parts, 1998 and 199, that added together give a cube (2197 = 13³).

The spelling of 1998199 in words is "one million, nine hundred ninety-eight thousand, one hundred ninety-nine".