218646946 has 32 divisors (see below), whose sum is σ = 395948160. Its totient is φ = 88459776.

The previous prime is 218646941. The next prime is 218646971. The reversal of 218646946 is 649646812.

It is a junction number, because it is equal to n+sod(n) for n = 218646896 and 218646905.

It is not an unprimeable number, because it can be changed into a prime (218646941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83026 + ... + 85618.

It is an arithmetic number, because the mean of its divisors is an integer number (12373380).

Almost surely, 2^218646946 is an apocalyptic number.

218646946 is a deficient number, since it is larger than the sum of its proper divisors (177301214).

218646946 is a wasteful number, since it uses less digits than its factorization.

218646946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938.

The product of its digits is 497664, while the sum is 46.

The square root of 218646946 is about 14786.7151862745. The cubic root of 218646946 is about 602.4409322097.

The spelling of 218646946 in words is "two hundred eighteen million, six hundred forty-six thousand, nine hundred forty-six".