181964 has 6 divisors (see below), whose sum is σ = 318444. Its totient is φ = 90980.

The previous prime is 181957. The next prime is 181967. The reversal of 181964 is 469181.

181964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181964² = 66221794592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22742 + ... + 22749.

It is an arithmetic number, because the mean of its divisors is an integer number (53074).

2¹⁸¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

181964 is a deficient number, since it is larger than the sum of its proper divisors (136480).

181964 is a wasteful number, since it uses less digits than its factorization.

181964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45495 (or 45493 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 181964 is about 426.5723854166. The cubic root of 181964 is about 56.6667743174. Note that the first 3 decimals are identical.

The spelling of 181964 in words is "one hundred eighty-one thousand, nine hundred sixty-four".