199445990 has 16 divisors (see below), whose sum is σ = 359298720. Its totient is φ = 79712640.

The previous prime is 199445977. The next prime is 199446031. The reversal of 199445990 is 99544991.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5630 + ... + 20750.

It is an arithmetic number, because the mean of its divisors is an integer number (22456170).

Almost surely, 2^199445990 is an apocalyptic number.

199445990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199445990 is a deficient number, since it is larger than the sum of its proper divisors (159852730).

199445990 is a wasteful number, since it uses less digits than its factorization.

199445990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16447.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 199445990 is about 14122.5348291304. The cubic root of 199445990 is about 584.2630699291.

Subtracting from 199445990 its reverse (99544991), we obtain a palindrome (99900999).

The spelling of 199445990 in words is "one hundred ninety-nine million, four hundred forty-five thousand, nine hundred ninety".