218220838 has 12 divisors (see below), whose sum is σ = 359794260. Its totient is φ = 99191180.

The previous prime is 218220817. The next prime is 218220839. The reversal of 218220838 is 838022812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218220839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450628 + ... + 451111.

It is an arithmetic number, because the mean of its divisors is an integer number (29982855).

Almost surely, 2^218220838 is an apocalyptic number.

218220838 is a deficient number, since it is larger than the sum of its proper divisors (141573422).

218220838 is a wasteful number, since it uses less digits than its factorization.

218220838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901763 (or 901752 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 218220838 is about 14772.2996855601. The cubic root of 218220838 is about 602.0493239646.

The spelling of 218220838 in words is "two hundred eighteen million, two hundred twenty thousand, eight hundred thirty-eight".