218147838 has 16 divisors (see below), whose sum is σ = 436444176. Its totient is φ = 72691200.

The previous prime is 218147833. The next prime is 218147843. The reversal of 218147838 is 838741812.

It is an interprime number because it is at equal distance from previous prime (218147833) and next prime (218147843).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 218147838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218147833) 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, 25020 + ... + 32592.

It is an arithmetic number, because the mean of its divisors is an integer number (27277761).

Almost surely, 2^218147838 is an apocalyptic number.

218147838 is an abundant number, since it is smaller than the sum of its proper divisors (218296338).

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

218147838 is a wasteful number, since it uses less digits than its factorization.

218147838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12379.

The product of its digits is 86016, while the sum is 42.

The square root of 218147838 is about 14769.8286381393. The cubic root of 218147838 is about 601.9821832602.

The spelling of 218147838 in words is "two hundred eighteen million, one hundred forty-seven thousand, eight hundred thirty-eight".