169959 has 8 divisors (see below), whose sum is σ = 228592. Its totient is φ = 112320.

The previous prime is 169957. The next prime is 169987. The reversal of 169959 is 959961.

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

It is not a de Polignac number, because 169959 - 2¹ = 169957 is a prime.

It is a Duffinian number.

169959 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 169959.

It is not an unprimeable number, because it can be changed into a prime (169951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (28574).

2¹⁶⁹⁹⁵⁹ is an apocalyptic number.

169959 is a deficient number, since it is larger than the sum of its proper divisors (58633).

169959 is a wasteful number, since it uses less digits than its factorization.

169959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its digits is 21870, while the sum is 39.

The square root of 169959 is about 412.2608397605. The cubic root of 169959 is about 55.3921287587.

It can be divided in two parts, 169 and 959, that added together give a triangular number (1128 = T₄₇).

The spelling of 169959 in words is "one hundred sixty-nine thousand, nine hundred fifty-nine".