199998000 has 240 divisors, whose sum is σ = 718204032. Its totient is φ = 51840000.

The previous prime is 199997999. The next prime is 199998049. The reversal of 199998000 is 899991.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 737865 + ... + 738135.

Almost surely, 2^199998000 is an apocalyptic number.

199998000 is a gapful number since it is divisible by the number (10) 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 199998000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359102016).

199998000 is an abundant number, since it is smaller than the sum of its proper divisors (518206032).

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

199998000 is a wasteful number, since it uses less digits than its factorization.

199998000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 199998000 is about 14142.0649128761. The cubic root of 199998000 is about 584.8015982909.

It can be divided in two parts, 1999 and 98000, that added together give a palindrome (99999).

The spelling of 199998000 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand".