199986493 has 24 divisors (see below), whose sum is σ = 237962688. Its totient is φ = 168031584.

The previous prime is 199986461. The next prime is 199986529. The reversal of 199986493 is 394689991.

It is not a de Polignac number, because 199986493 - 2⁵ = 199986461 is a prime.

It is a Duffinian number.

Its product of digits (3779136) is a multiple of the sum of its prime divisors (243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199981493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1226830 + ... + 1226992.

It is an arithmetic number, because the mean of its divisors is an integer number (9915112).

Almost surely, 2^199986493 is an apocalyptic number.

It is an amenable number.

199986493 is a deficient number, since it is larger than the sum of its proper divisors (37976195).

199986493 is an frugal number, since it uses more digits than its factorization.

199986493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 243 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 58.

The square root of 199986493 is about 14141.6580711033. The cubic root of 199986493 is about 584.7903824437.

The spelling of 199986493 in words is "one hundred ninety-nine million, nine hundred eighty-six thousand, four hundred ninety-three".