181887 has 8 divisors (see below), whose sum is σ = 255360. Its totient is φ = 114840.

The previous prime is 181873. The next prime is 181889. The reversal of 181887 is 788181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181887 - 2⁴ = 181871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181889) 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, 1539 + ... + 1652.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2¹⁸¹⁸⁸⁷ is an apocalyptic number.

181887 is a deficient number, since it is larger than the sum of its proper divisors (73473).

181887 is a wasteful number, since it uses less digits than its factorization.

181887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213.

The product of its digits is 3584, while the sum is 33.

The square root of 181887 is about 426.4821215479. The cubic root of 181887 is about 56.6587801404.

The spelling of 181887 in words is "one hundred eighty-one thousand, eight hundred eighty-seven".