199989858 has 32 divisors (see below), whose sum is σ = 435556800. Its totient is φ = 60975936.

The previous prime is 199989857. The next prime is 199989859. The reversal of 199989858 is 858989991.

It is an interprime number because it is at equal distance from previous prime (199989857) and next prime (199989859).

It is not an unprimeable number, because it can be changed into a prime (199989857) 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, 26941 + ... + 33552.

It is an arithmetic number, because the mean of its divisors is an integer number (13611150).

Almost surely, 2^199989858 is an apocalyptic number.

199989858 is an abundant number, since it is smaller than the sum of its proper divisors (235566942).

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

199989858 is a wasteful number, since it uses less digits than its factorization.

199989858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60546.

The product of its digits is 16796160, while the sum is 66.

The square root of 199989858 is about 14141.7770453363. Note that the first 3 decimals coincide. The cubic root of 199989858 is about 584.7936623462.

The spelling of 199989858 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred fifty-eight".