219987 has 6 divisors (see below), whose sum is σ = 317772. Its totient is φ = 146652.

The previous prime is 219983. The next prime is 220009. The reversal of 219987 is 789912.

It is a happy number.

219987 is nontrivially palindromic in base 16.

219987 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 219987 - 2² = 219983 is a prime.

219987 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (219983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12213 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (52962).

2²¹⁹⁹⁸⁷ is an apocalyptic number.

219987 is a deficient number, since it is larger than the sum of its proper divisors (97785).

219987 is a wasteful number, since it uses less digits than its factorization.

219987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24449 (or 24446 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 219987 is about 469.0277177311. The cubic root of 219987 is about 60.3669182758.

It can be divided in two parts, 219 and 987, that multiplied together give a triangular number (216153 = T₆₅₇).

The spelling of 219987 in words is "two hundred nineteen thousand, nine hundred eighty-seven".