218041806 has 16 divisors (see below), whose sum is σ = 436453200. Its totient is φ = 72619008.

The previous prime is 218041801. The next prime is 218041819. The reversal of 218041806 is 608140812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218041801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7411 + ... + 22158.

It is an arithmetic number, because the mean of its divisors is an integer number (27278325).

Almost surely, 2^218041806 is an apocalyptic number.

218041806 is an abundant number, since it is smaller than the sum of its proper divisors (218411394).

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

218041806 is a wasteful number, since it uses less digits than its factorization.

218041806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30803.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 218041806 is about 14766.2387221662. The cubic root of 218041806 is about 601.8846351635.

The spelling of 218041806 in words is "two hundred eighteen million, forty-one thousand, eight hundred six".