169940 has 24 divisors (see below), whose sum is σ = 370440. Its totient is φ = 65408.

The previous prime is 169937. The next prime is 169943. The reversal of 169940 is 49961.

169940 = T₂₃₅ + T₂₃₆ + ... + T₂₄₀.

It is an interprime number because it is at equal distance from previous prime (169937) and next prime (169943).

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 114244 = 236^2 + 338^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an Ulam number.

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 169940.

It is not an unprimeable number, because it can be changed into a prime (169943) 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, 434 + ... + 726.

It is an arithmetic number, because the mean of its divisors is an integer number (15435).

2¹⁶⁹⁹⁴⁰ is an apocalyptic number.

169940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185220).

169940 is an abundant number, since it is smaller than the sum of its proper divisors (200500).

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

169940 is a wasteful number, since it uses less digits than its factorization.

169940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 329 counting only the distinct ones).

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

The square root of 169940 is about 412.2377954531. The cubic root of 169940 is about 55.3900645557.

The spelling of 169940 in words is "one hundred sixty-nine thousand, nine hundred forty".