199438990 has 8 divisors (see below), whose sum is σ = 358990200. Its totient is φ = 79775592.

The previous prime is 199438963. The next prime is 199439041. The reversal of 199438990 is 99834991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9971940 + ... + 9971959.

It is an arithmetic number, because the mean of its divisors is an integer number (44873775).

Almost surely, 2^199438990 is an apocalyptic number.

199438990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199438990 is a deficient number, since it is larger than the sum of its proper divisors (159551210).

199438990 is a wasteful number, since it uses less digits than its factorization.

199438990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19943906.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 199438990 is about 14122.2869960924. The cubic root of 199438990 is about 584.2562345125.

The spelling of 199438990 in words is "one hundred ninety-nine million, four hundred thirty-eight thousand, nine hundred ninety".