218225994 has 16 divisors (see below), whose sum is σ = 498802368. Its totient is φ = 62350272.

The previous prime is 218225977. The next prime is 218225999. The reversal of 218225994 is 499522812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5195857 = 218225994 / (2 + 1 + 8 + 2 + 2 + 5 + 9 + 9 + 4).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218225999) 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 7 ways as a sum of consecutive naturals, for example, 2597887 + ... + 2597970.

It is an arithmetic number, because the mean of its divisors is an integer number (31175148).

Almost surely, 2^218225994 is an apocalyptic number.

218225994 is an abundant number, since it is smaller than the sum of its proper divisors (280576374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218225994 is a wasteful number, since it uses less digits than its factorization.

218225994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195869.

The product of its digits is 103680, while the sum is 42.

The square root of 218225994 is about 14772.4742003498. The cubic root of 218225994 is about 602.0540655555.

The spelling of 218225994 in words is "two hundred eighteen million, two hundred twenty-five thousand, nine hundred ninety-four".