181916 has 24 divisors (see below), whose sum is σ = 372960. Its totient is φ = 76032.

The previous prime is 181913. The next prime is 181919. The reversal of 181916 is 619181.

181916 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

181916 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (181913) and next prime (181919).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181913) 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, 2000 + ... + 2088.

It is an arithmetic number, because the mean of its divisors is an integer number (15540).

2¹⁸¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

181916 is an abundant number, since it is smaller than the sum of its proper divisors (191044).

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

181916 is a wasteful number, since it uses less digits than its factorization.

181916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 171 counting only the distinct ones).

The product of its digits is 432, while the sum is 26.

The square root of 181916 is about 426.5161192734. The cubic root of 181916 is about 56.6617911991.

The spelling of 181916 in words is "one hundred eighty-one thousand, nine hundred sixteen".