218557842 has 16 divisors (see below), whose sum is σ = 437261760. Its totient is φ = 72828272.

The previous prime is 218557813. The next prime is 218557861. The reversal of 218557842 is 248755812.

218557842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 218557794 and 218557803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28384 + ... + 35252.

It is an arithmetic number, because the mean of its divisors is an integer number (27328860).

Almost surely, 2^218557842 is an apocalyptic number.

218557842 is an abundant number, since it is smaller than the sum of its proper divisors (218703918).

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

218557842 is a wasteful number, since it uses less digits than its factorization.

218557842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12177.

The product of its digits is 179200, while the sum is 42.

The square root of 218557842 is about 14783.7019044622. The cubic root of 218557842 is about 602.3590845989.

The spelling of 218557842 in words is "two hundred eighteen million, five hundred fifty-seven thousand, eight hundred forty-two".