199279988 has 6 divisors (see below), whose sum is σ = 348739986. Its totient is φ = 99639992.

The previous prime is 199279987. The next prime is 199280009. The reversal of 199279988 is 889972991.

199279988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 183819364 + 15460624 = 13558^2 + 3932^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 199279988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199279987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24909995 + ... + 24910002.

It is an arithmetic number, because the mean of its divisors is an integer number (58123331).

Almost surely, 2^199279988 is an apocalyptic number.

It is an amenable number.

199279988 is a deficient number, since it is larger than the sum of its proper divisors (149459998).

199279988 is a wasteful number, since it uses less digits than its factorization.

199279988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820001 (or 49819999 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 62.

The square root of 199279988 is about 14116.6564029872. The cubic root of 199279988 is about 584.1009278558.

The spelling of 199279988 in words is "one hundred ninety-nine million, two hundred seventy-nine thousand, nine hundred eighty-eight".