218243039 has 4 divisors (see below), whose sum is σ = 249420624. Its totient is φ = 187065456.

The previous prime is 218243033. The next prime is 218243071. The reversal of 218243039 is 930342812.

It is a happy number.

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 218243039 - 2¹⁶ = 218177503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218242996 and 218243014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218243033) 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, 15588782 + ... + 15588795.

It is an arithmetic number, because the mean of its divisors is an integer number (62355156).

Almost surely, 2^218243039 is an apocalyptic number.

218243039 is a deficient number, since it is larger than the sum of its proper divisors (31177585).

218243039 is an equidigital number, since it uses as much as digits as its factorization.

218243039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31177584.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 218243039 is about 14773.0511066604. The cubic root of 218243039 is about 602.0697400469.

The spelling of 218243039 in words is "two hundred eighteen million, two hundred forty-three thousand, thirty-nine".