22987 has 4 divisors (see below), whose sum is σ = 23296. Its totient is φ = 22680.

The previous prime is 22973. The next prime is 22993. The reversal of 22987 is 78922.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78922 = 2 ⋅39461.

It is a cyclic number.

It is not a de Polignac number, because 22987 - 2⁷ = 22859 is a prime.

It is an Ulam number.

It is a Duffinian number.

22987 is a lucky number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (22907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37 + ... + 217.

It is an arithmetic number, because the mean of its divisors is an integer number (5824).

2²²⁹⁸⁷ is an apocalyptic number.

22987 is a deficient number, since it is larger than the sum of its proper divisors (309).

22987 is a wasteful number, since it uses less digits than its factorization.

22987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its digits is 2016, while the sum is 28.

The square root of 22987 is about 151.6146430923. The cubic root of 22987 is about 28.4333107785.

The spelling of 22987 in words is "twenty-two thousand, nine hundred eighty-seven".