181040 has 40 divisors (see below), whose sum is σ = 440448. Its totient is φ = 69120.

The previous prime is 181039. The next prime is 181061. The reversal of 181040 is 40181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181040.

It is an unprimeable number.

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, 2444 + ... + 2516.

2¹⁸¹⁰⁴⁰ is an apocalyptic number.

181040 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 181040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220224).

181040 is an abundant number, since it is smaller than the sum of its proper divisors (259408).

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

181040 is a wasteful number, since it uses less digits than its factorization.

181040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 181040 is about 425.4879551762. The cubic root of 181040 is about 56.5706949147.

The spelling of 181040 in words is "one hundred eighty-one thousand, forty".