218146446 has 48 divisors (see below), whose sum is σ = 560187264. Its totient is φ = 62326584.

The previous prime is 218146433. The next prime is 218146457. The reversal of 218146446 is 644641812.

It is a happy number.

218146446 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 4 + 644 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 218146446.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 28660 + ... + 35463.

It is an arithmetic number, because the mean of its divisors is an integer number (11670568).

Almost surely, 2^218146446 is an apocalyptic number.

218146446 is an abundant number, since it is smaller than the sum of its proper divisors (342040818).

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

218146446 is an equidigital number, since it uses as much as digits as its factorization.

218146446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64147 (or 64135 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 218146446 is about 14769.7815149717. The cubic root of 218146446 is about 601.9809028426.

The spelling of 218146446 in words is "two hundred eighteen million, one hundred forty-six thousand, four hundred forty-six".