199677638 has 16 divisors (see below), whose sum is σ = 308276496. Its totient is φ = 96946080.

The previous prime is 199677623. The next prime is 199677649. The reversal of 199677638 is 836776991.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8168 + ... + 21588.

It is an arithmetic number, because the mean of its divisors is an integer number (19267281).

Almost surely, 2^199677638 is an apocalyptic number.

199677638 is a deficient number, since it is larger than the sum of its proper divisors (108598858).

199677638 is a wasteful number, since it uses less digits than its factorization.

199677638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13639.

The product of its digits is 3429216, while the sum is 56.

The square root of 199677638 is about 14130.7338096788. The cubic root of 199677638 is about 584.4891812804.

The spelling of 199677638 in words is "one hundred ninety-nine million, six hundred seventy-seven thousand, six hundred thirty-eight".