218432087 has 4 divisors (see below), whose sum is σ = 218643360. Its totient is φ = 218220816.

The previous prime is 218432083. The next prime is 218432117. The reversal of 218432087 is 780234812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218432087 - 2² = 218432083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218432083) 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 3 ways as a sum of consecutive naturals, for example, 104078 + ... + 106155.

It is an arithmetic number, because the mean of its divisors is an integer number (54660840).

Almost surely, 2^218432087 is an apocalyptic number.

218432087 is a deficient number, since it is larger than the sum of its proper divisors (211273).

218432087 is a wasteful number, since it uses less digits than its factorization.

218432087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211272.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 218432087 is about 14779.4481290744. The cubic root of 218432087 is about 602.2435328849.

Adding to 218432087 its reverse (780234812), we get a palindrome (998666899).

The spelling of 218432087 in words is "two hundred eighteen million, four hundred thirty-two thousand, eighty-seven".