199997100 has 90 divisors (see below), whose sum is σ = 648337844. Its totient is φ = 53330400.

The previous prime is 199997081. The next prime is 199997107. The reversal of 199997100 is 1799991.

199997100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (90).

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

It is not an unprimeable number, because it can be changed into a prime (199997107) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4246 + ... + 20445.

Almost surely, 2^199997100 is an apocalyptic number.

199997100 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 199997100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324168922).

199997100 is an abundant number, since it is smaller than the sum of its proper divisors (448340744).

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

199997100 is a wasteful number, since it uses less digits than its factorization.

199997100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24717 (or 24701 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 199997100 is about 14142.0330928760. The cubic root of 199997100 is about 584.8007210784.

It can be divided in two parts, 1999 and 97100, that added together give a palindrome (99099).

The spelling of 199997100 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred".