199110990 has 64 divisors (see below), whose sum is σ = 516612096. Its totient is φ = 48822912.

The previous prime is 199110973. The next prime is 199110991. The reversal of 199110990 is 99011991.

199110990 is a nontrivial binomial coefficient, being equal to C(19956, 2).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199110991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118899 + ... + 120561.

It is an arithmetic number, because the mean of its divisors is an integer number (8072064).

Almost surely, 2^199110990 is an apocalyptic number.

199110990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199110990 is the 19955-th triangular number and also the 9978-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199110990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258306048).

199110990 is an abundant number, since it is smaller than the sum of its proper divisors (317501106).

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

199110990 is a wasteful number, since it uses less digits than its factorization.

199110990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 199110990 is about 14110.6693675389. The cubic root of 199110990 is about 583.9357669236.

The spelling of 199110990 in words is "one hundred ninety-nine million, one hundred ten thousand, nine hundred ninety".