197879 has 4 divisors (see below), whose sum is σ = 215880. Its totient is φ = 179880.

The previous prime is 197837. The next prime is 197887. The reversal of 197879 is 978791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197279) 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, 8984 + ... + 9005.

It is an arithmetic number, because the mean of its divisors is an integer number (53970).

2¹⁹⁷⁸⁷⁹ is an apocalyptic number.

197879 is a deficient number, since it is larger than the sum of its proper divisors (18001).

197879 is a wasteful number, since it uses less digits than its factorization.

197879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18000.

The product of its digits is 31752, while the sum is 41.

The square root of 197879 is about 444.8359248082. The cubic root of 197879 is about 58.2728915903.

The spelling of 197879 in words is "one hundred ninety-seven thousand, eight hundred seventy-nine".