218055447 has 12 divisors (see below), whose sum is σ = 333496800. Its totient is φ = 136819008.

The previous prime is 218055377. The next prime is 218055491. The reversal of 218055447 is 744550812.

218055447 is a `hidden beast` number, since 21 + 80 + 554 + 4 + 7 = 666.

It is not a de Polignac number, because 218055447 - 2¹⁰ = 218054423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218050447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 712447 + ... + 712752.

It is an arithmetic number, because the mean of its divisors is an integer number (27791400).

Almost surely, 2^218055447 is an apocalyptic number.

218055447 is a deficient number, since it is larger than the sum of its proper divisors (115441353).

218055447 is a wasteful number, since it uses less digits than its factorization.

218055447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425222 (or 1425219 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 218055447 is about 14766.7006132040. The cubic root of 218055447 is about 601.8971864830.

The spelling of 218055447 in words is "two hundred eighteen million, fifty-five thousand, four hundred forty-seven".