169640 has 16 divisors (see below), whose sum is σ = 381780. Its totient is φ = 67840.

The previous prime is 169639. The next prime is 169649. The reversal of 169640 is 46961.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 11236 = 398^2 + 106^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (169649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081 + ... + 2160.

2¹⁶⁹⁶⁴⁰ is an apocalyptic number.

169640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

169640 is an abundant number, since it is smaller than the sum of its proper divisors (212140).

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

169640 is a wasteful number, since it uses less digits than its factorization.

169640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252 (or 4248 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 169640 is about 411.8737670695. The cubic root of 169640 is about 55.3574514625.

The spelling of 169640 in words is "one hundred sixty-nine thousand, six hundred forty".