199947 has 16 divisors (see below), whose sum is σ = 298368. Its totient is φ = 118080.

The previous prime is 199933. The next prime is 199961. The reversal of 199947 is 749991.

It is an interprime number because it is at equal distance from previous prime (199933) and next prime (199961).

It is not a de Polignac number, because 199947 - 2⁴ = 199931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199967) 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, 2368 + ... + 2450.

It is an arithmetic number, because the mean of its divisors is an integer number (18648).

2¹⁹⁹⁹⁴⁷ is an apocalyptic number.

199947 is a deficient number, since it is larger than the sum of its proper divisors (98421).

199947 is a wasteful number, since it uses less digits than its factorization.

199947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170.

The product of its digits is 20412, while the sum is 39.

The square root of 199947 is about 447.1543357723. The cubic root of 199947 is about 58.4751885432.

The spelling of 199947 in words is "one hundred ninety-nine thousand, nine hundred forty-seven".