218918132 has 6 divisors (see below), whose sum is σ = 383106738. Its totient is φ = 109459064.

The previous prime is 218918123. The next prime is 218918137. The reversal of 218918132 is 231819812.

218918132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 218862436 + 55696 = 14794^2 + 236^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218918092 and 218918101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218918137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27364763 + ... + 27364770.

It is an arithmetic number, because the mean of its divisors is an integer number (63851123).

Almost surely, 2^218918132 is an apocalyptic number.

It is an amenable number.

218918132 is a deficient number, since it is larger than the sum of its proper divisors (164188606).

218918132 is a wasteful number, since it uses less digits than its factorization.

218918132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54729537 (or 54729535 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 218918132 is about 14795.8822650087. The cubic root of 218918132 is about 602.6898968115.

The spelling of 218918132 in words is "two hundred eighteen million, nine hundred eighteen thousand, one hundred thirty-two".