218141388 has 18 divisors (see below), whose sum is σ = 551413044. Its totient is φ = 72713784.

The previous prime is 218141383. The next prime is 218141431. The reversal of 218141388 is 883141812.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6059483 = 218141388 / (2 + 1 + 8 + 1 + 4 + 1 + 3 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (218141383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3029706 + ... + 3029777.

It is an arithmetic number, because the mean of its divisors is an integer number (30634058).

Almost surely, 2^218141388 is an apocalyptic number.

It is an amenable number.

218141388 is an abundant number, since it is smaller than the sum of its proper divisors (333271656).

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

218141388 is a wasteful number, since it uses less digits than its factorization.

218141388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6059493 (or 6059488 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 218141388 is about 14769.6102859893. The cubic root of 218141388 is about 601.9762502450.

The spelling of 218141388 in words is "two hundred eighteen million, one hundred forty-one thousand, three hundred eighty-eight".