218389039 has 4 divisors (see below), whose sum is σ = 238242600. Its totient is φ = 198535480.

The previous prime is 218389037. The next prime is 218389049. The reversal of 218389039 is 930983812.

It is a happy number.

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

It is not a de Polignac number, because 218389039 - 2¹ = 218389037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218388986 and 218389004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218389037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9926764 + ... + 9926785.

It is an arithmetic number, because the mean of its divisors is an integer number (59560650).

Almost surely, 2^218389039 is an apocalyptic number.

218389039 is a deficient number, since it is larger than the sum of its proper divisors (19853561).

218389039 is a wasteful number, since it uses less digits than its factorization.

218389039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19853560.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 218389039 is about 14777.9917106486. The cubic root of 218389039 is about 602.2039674479.

The spelling of 218389039 in words is "two hundred eighteen million, three hundred eighty-nine thousand, thirty-nine".