169490 has 16 divisors (see below), whose sum is σ = 323352. Its totient is φ = 63744.

The previous prime is 169489. The next prime is 169493. The reversal of 169490 is 94961.

It can be written as a sum of positive squares in 4 ways, for example, as 167281 + 2209 = 409^2 + 47^2 .

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 (169493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329 + ... + 668.

2¹⁶⁹⁴⁹⁰ is an apocalyptic number.

169490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

169490 is a deficient number, since it is larger than the sum of its proper divisors (153862).

169490 is a wasteful number, since it uses less digits than its factorization.

169490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 169490 is about 411.6916321715. The cubic root of 169490 is about 55.3411304959.

Subtracting from 169490 its reverse (94961), we obtain a square (74529 = 273²).

The spelling of 169490 in words is "one hundred sixty-nine thousand, four hundred ninety".