218415948 has 12 divisors (see below), whose sum is σ = 509637240. Its totient is φ = 72805312.

The previous prime is 218415947. The next prime is 218416019. The reversal of 218415948 is 849514812.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (218415941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9100653 + ... + 9100676.

It is an arithmetic number, because the mean of its divisors is an integer number (42469770).

Almost surely, 2^218415948 is an apocalyptic number.

It is an amenable number.

218415948 is an abundant number, since it is smaller than the sum of its proper divisors (291221292).

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

218415948 is a wasteful number, since it uses less digits than its factorization.

218415948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201336 (or 18201334 counting only the distinct ones).

The product of its digits is 92160, while the sum is 42.

The square root of 218415948 is about 14778.9021243122. The cubic root of 218415948 is about 602.2287001316.

The spelling of 218415948 in words is "two hundred eighteen million, four hundred fifteen thousand, nine hundred forty-eight".