199890242 has 8 divisors (see below), whose sum is σ = 305492796. Its totient is φ = 98059312.

The previous prime is 199890239. The next prime is 199890277. The reversal of 199890242 is 242098991.

It can be written as a sum of positive squares in 2 ways, for example, as 177715561 + 22174681 = 13331^2 + 4709^2 .

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

It is a super-2 number, since 2×199890242² = 79912217693637128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199890193 and 199890202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942773 + ... + 942984.

Almost surely, 2^199890242 is an apocalyptic number.

199890242 is a deficient number, since it is larger than the sum of its proper divisors (105602554).

199890242 is a wasteful number, since it uses less digits than its factorization.

199890242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885812.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 199890242 is about 14138.2545598811. The cubic root of 199890242 is about 584.6965499541.

The spelling of 199890242 in words is "one hundred ninety-nine million, eight hundred ninety thousand, two hundred forty-two".