218401132 has 12 divisors (see below), whose sum is σ = 382306680. Its totient is φ = 109170656.

The previous prime is 218401129. The next prime is 218401133. The reversal of 218401132 is 231104812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (218401133) 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, 21003 + ... + 29629.

It is an arithmetic number, because the mean of its divisors is an integer number (31858890).

Almost surely, 2^218401132 is an apocalyptic number.

It is an amenable number.

218401132 is a deficient number, since it is larger than the sum of its proper divisors (163905548).

218401132 is a wasteful number, since it uses less digits than its factorization.

218401132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14960 (or 14958 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 218401132 is about 14778.4008607156. The cubic root of 218401132 is about 602.2150826550.

Adding to 218401132 its reverse (231104812), we get a palindrome (449505944).

The spelling of 218401132 in words is "two hundred eighteen million, four hundred one thousand, one hundred thirty-two".