181940 has 24 divisors (see below), whose sum is σ = 417312. Its totient is φ = 66080.

The previous prime is 181931. The next prime is 181943. The reversal of 181940 is 49181.

181940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181943) 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, 194 + ... + 633.

It is an arithmetic number, because the mean of its divisors is an integer number (17388).

2¹⁸¹⁹⁴⁰ is an apocalyptic number.

181940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181940 is an abundant number, since it is smaller than the sum of its proper divisors (235372).

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

181940 is a wasteful number, since it uses less digits than its factorization.

181940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 181940 is about 426.5442532727. The cubic root of 181940 is about 56.6642828678.

The spelling of 181940 in words is "one hundred eighty-one thousand, nine hundred forty".