199243690 has 32 divisors (see below), whose sum is σ = 383725440. Its totient is φ = 74260800.

The previous prime is 199243673. The next prime is 199243697. The reversal of 199243690 is 96342991.

It is a super-2 number, since 2×199243690² = 79396096009632200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (199243697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2995 + ... + 20185.

It is an arithmetic number, because the mean of its divisors is an integer number (11991420).

Almost surely, 2^199243690 is an apocalyptic number.

199243690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199243690 is a deficient number, since it is larger than the sum of its proper divisors (184481750).

199243690 is a wasteful number, since it uses less digits than its factorization.

199243690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17278.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 199243690 is about 14115.3707000560. The cubic root of 199243690 is about 584.0654618713.

The spelling of 199243690 in words is "one hundred ninety-nine million, two hundred forty-three thousand, six hundred ninety".