218421876 has 48 divisors (see below), whose sum is σ = 519494976. Its totient is φ = 71410944.

The previous prime is 218421871. The next prime is 218421937. The reversal of 218421876 is 678124812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218421871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254440 + ... + 255296.

It is an arithmetic number, because the mean of its divisors is an integer number (10822812).

Almost surely, 2^218421876 is an apocalyptic number.

It is an amenable number.

218421876 is an abundant number, since it is smaller than the sum of its proper divisors (301073100).

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

218421876 is a wasteful number, since it uses less digits than its factorization.

218421876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248 (or 1246 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 218421876 is about 14779.1026791209. The cubic root of 218421876 is about 602.2341484203.

The spelling of 218421876 in words is "two hundred eighteen million, four hundred twenty-one thousand, eight hundred seventy-six".