218939073 has 8 divisors (see below), whose sum is σ = 309090528. Its totient is φ = 137373504.

The previous prime is 218939069. The next prime is 218939137. The reversal of 218939073 is 370939812.

218939073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218939073 - 2² = 218939069 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (218939023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146411 + ... + 2146512.

It is an arithmetic number, because the mean of its divisors is an integer number (38636316).

Almost surely, 2^218939073 is an apocalyptic number.

It is an amenable number.

218939073 is a deficient number, since it is larger than the sum of its proper divisors (90151455).

218939073 is a wasteful number, since it uses less digits than its factorization.

218939073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292943.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 218939073 is about 14796.5899111924. The cubic root of 218939073 is about 602.7091133204.

The spelling of 218939073 in words is "two hundred eighteen million, nine hundred thirty-nine thousand, seventy-three".