199212990 has 32 divisors (see below), whose sum is σ = 479277216. Its totient is φ = 52993920.

The previous prime is 199212989. The next prime is 199212991. The reversal of 199212990 is 99212991.

It is an interprime number because it is at equal distance from previous prime (199212989) and next prime (199212991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199212991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4744 + ... + 20516.

It is an arithmetic number, because the mean of its divisors is an integer number (14977413).

Almost surely, 2^199212990 is an apocalyptic number.

199212990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199212990 is an abundant number, since it is smaller than the sum of its proper divisors (280064226).

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

199212990 is a wasteful number, since it uses less digits than its factorization.

199212990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16204.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 199212990 is about 14114.2831911507. The cubic root of 199212990 is about 584.0354622083.

Subtracting from 199212990 its reverse (99212991), we obtain a palindrome (99999999).

The spelling of 199212990 in words is "one hundred ninety-nine million, two hundred twelve thousand, nine hundred ninety".