166240 has 24 divisors (see below), whose sum is σ = 393120. Its totient is φ = 66432.

The previous prime is 166237. The next prime is 166247. The reversal of 166240 is 42661.

166240 = 16² + 17² + ... + 79².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166247) 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, 360 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (16380).

2¹⁶⁶²⁴⁰ is an apocalyptic number.

166240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166240 is an abundant number, since it is smaller than the sum of its proper divisors (226880).

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

166240 is a wasteful number, since it uses less digits than its factorization.

166240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 166240 is about 407.7253977863. The cubic root of 166240 is about 54.9851199416.

It can be divided in two parts, 166 and 240, that added together give a triangular number (406 = T₂₈).

The spelling of 166240 in words is "one hundred sixty-six thousand, two hundred forty".