169990 has 16 divisors (see below), whose sum is σ = 311040. Its totient is φ = 66880.

The previous prime is 169987. The next prime is 169991. The reversal of 169990 is 99961.

It is a happy number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169991) 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, 795 + ... + 985.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2¹⁶⁹⁹⁹⁰ is an apocalyptic number.

169990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

169990 is a deficient number, since it is larger than the sum of its proper divisors (141050).

169990 is a wasteful number, since it uses less digits than its factorization.

169990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 169990 is about 412.2984356022. The cubic root of 169990 is about 55.3954963387.

The spelling of 169990 in words is "one hundred sixty-nine thousand, nine hundred ninety".