218117943 has 12 divisors (see below), whose sum is σ = 315308448. Its totient is φ = 145296960.

The previous prime is 218117927. The next prime is 218117957. The reversal of 218117943 is 349711812.

It is a happy number.

It is not a de Polignac number, because 218117943 - 2⁴ = 218117927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218117898 and 218117907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218117143) 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 11 ways as a sum of consecutive naturals, for example, 3346 + ... + 21152.

It is an arithmetic number, because the mean of its divisors is an integer number (26275704).

Almost surely, 2^218117943 is an apocalyptic number.

218117943 is a deficient number, since it is larger than the sum of its proper divisors (97190505).

218117943 is a wasteful number, since it uses less digits than its factorization.

218117943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19174 (or 19171 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 218117943 is about 14768.8165741199. The cubic root of 218117943 is about 601.9546834392.

The spelling of 218117943 in words is "two hundred eighteen million, one hundred seventeen thousand, nine hundred forty-three".