218895139 has 4 divisors (see below), whose sum is σ = 219092224. Its totient is φ = 218698056.

The previous prime is 218895137. The next prime is 218895167. The reversal of 218895139 is 931598812.

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 218895139 - 2¹ = 218895137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218895137) 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, 96867 + ... + 99100.

It is an arithmetic number, because the mean of its divisors is an integer number (54773056).

Almost surely, 2^218895139 is an apocalyptic number.

218895139 is a deficient number, since it is larger than the sum of its proper divisors (197085).

218895139 is a wasteful number, since it uses less digits than its factorization.

218895139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197084.

The product of its digits is 155520, while the sum is 46.

The square root of 218895139 is about 14795.1052378819. The cubic root of 218895139 is about 602.6687958732.

It can be divided in two parts, 21889 and 5139, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 218895139 in words is "two hundred eighteen million, eight hundred ninety-five thousand, one hundred thirty-nine".