218086438 has 32 divisors (see below), whose sum is σ = 360106560. Its totient is φ = 98713216.

The previous prime is 218086433. The next prime is 218086459. The reversal of 218086438 is 834680812.

It is a self number, because there is not a number n which added to its sum of digits gives 218086438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218086433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829095 + ... + 829357.

It is an arithmetic number, because the mean of its divisors is an integer number (11253330).

Almost surely, 2^218086438 is an apocalyptic number.

218086438 is a deficient number, since it is larger than the sum of its proper divisors (142020122).

218086438 is an equidigital number, since it uses as much as digits as its factorization.

218086438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 218086438 is about 14767.7499301688. The cubic root of 218086438 is about 601.9256998914.

The spelling of 218086438 in words is "two hundred eighteen million, eighty-six thousand, four hundred thirty-eight".