218492406 has 24 divisors (see below), whose sum is σ = 516437064. Its totient is φ = 66209760.

The previous prime is 218492401. The next prime is 218492413. The reversal of 218492406 is 604294812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218492401) 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, 551551 + ... + 551946.

It is an arithmetic number, because the mean of its divisors is an integer number (21518211).

Almost surely, 2^218492406 is an apocalyptic number.

218492406 is an abundant number, since it is smaller than the sum of its proper divisors (297944658).

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

218492406 is a wasteful number, since it uses less digits than its factorization.

218492406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103516 (or 1103513 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 218492406 is about 14781.4886259808. The cubic root of 218492406 is about 602.2989633619.

The spelling of 218492406 in words is "two hundred eighteen million, four hundred ninety-two thousand, four hundred six".