199767990 has 32 divisors (see below), whose sum is σ = 491139936. Its totient is φ = 51971840.

The previous prime is 199767989. The next prime is 199767991. The reversal of 199767990 is 99767991.

It is an interprime number because it is at equal distance from previous prime (199767989) and next prime (199767991).

It is a self number, because there is not a number n which added to its sum of digits gives 199767990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199767991) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 79977 + ... + 82436.

It is an arithmetic number, because the mean of its divisors is an integer number (15348123).

Almost surely, 2^199767990 is an apocalyptic number.

199767990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199767990 is an abundant number, since it is smaller than the sum of its proper divisors (291371946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199767990 is a wasteful number, since it uses less digits than its factorization.

199767990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162464.

The product of its (nonzero) digits is 1928934, while the sum is 57.

The square root of 199767990 is about 14133.9304512227. The cubic root of 199767990 is about 584.5773263589.

Subtracting from 199767990 its reverse (99767991), we obtain a palindrome (99999999).

It can be divided in two parts, 19976 and 7990, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 199767990 in words is "one hundred ninety-nine million, seven hundred sixty-seven thousand, nine hundred ninety".