169979 has 8 divisors (see below), whose sum is σ = 179520. Its totient is φ = 160776.

The previous prime is 169957. The next prime is 169987. The reversal of 169979 is 979961.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 169979 - 2¹² = 165883 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 169979.

It is not an unprimeable number, because it can be changed into a prime (169909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2504 + ... + 2570.

It is an arithmetic number, because the mean of its divisors is an integer number (22440).

2¹⁶⁹⁹⁷⁹ is an apocalyptic number.

169979 is a deficient number, since it is larger than the sum of its proper divisors (9541).

169979 is an equidigital number, since it uses as much as digits as its factorization.

169979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169.

The product of its digits is 30618, while the sum is 41.

The square root of 169979 is about 412.2850955346. The cubic root of 169979 is about 55.3943014379.

The spelling of 169979 in words is "one hundred sixty-nine thousand, nine hundred seventy-nine".