199387 has 4 divisors (see below), whose sum is σ = 208080. Its totient is φ = 190696.

The previous prime is 199379. The next prime is 199399. The reversal of 199387 is 783991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199387 - 2³ = 199379 is a prime.

It is a Duffinian number.

199387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (199337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312 + ... + 4357.

It is an arithmetic number, because the mean of its divisors is an integer number (52020).

2¹⁹⁹³⁸⁷ is an apocalyptic number.

199387 is a deficient number, since it is larger than the sum of its proper divisors (8693).

199387 is an equidigital number, since it uses as much as digits as its factorization.

199387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8692.

The product of its digits is 13608, while the sum is 37.

The square root of 199387 is about 446.5277147054. The cubic root of 199387 is about 58.4205461890.

It can be divided in two parts, 1993 and 87, that added together give a triangular number (2080 = T₆₄).

The spelling of 199387 in words is "one hundred ninety-nine thousand, three hundred eighty-seven".