169890 has 32 divisors (see below), whose sum is σ = 466560. Its totient is φ = 38784.

The previous prime is 169889. The next prime is 169891. The reversal of 169890 is 98961.

It is a happy number.

169890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (169889) and next prime (169891).

It is a super-2 number, since 2×169890² = 57725224200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (169891) 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, 195 + ... + 614.

It is an arithmetic number, because the mean of its divisors is an integer number (14580).

2¹⁶⁹⁸⁹⁰ is an apocalyptic number.

169890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

169890 is an abundant number, since it is smaller than the sum of its proper divisors (296670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

169890 is a wasteful number, since it uses less digits than its factorization.

169890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 169890 is about 412.1771463825. The cubic root of 169890 is about 55.3846317070.

The spelling of 169890 in words is "one hundred sixty-nine thousand, eight hundred ninety".