218335401 has 12 divisors (see below), whose sum is σ = 319174128. Its totient is φ = 143802744.

The previous prime is 218335399. The next prime is 218335417. The reversal of 218335401 is 104533812.

It is a happy number.

It is not a de Polignac number, because 218335401 - 2¹ = 218335399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218335421) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 145395 + ... + 146888.

It is an arithmetic number, because the mean of its divisors is an integer number (26597844).

Almost surely, 2^218335401 is an apocalyptic number.

It is an amenable number.

218335401 is a deficient number, since it is larger than the sum of its proper divisors (100838727).

218335401 is a wasteful number, since it uses less digits than its factorization.

218335401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292372 (or 292369 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 218335401 is about 14776.1768059265. The cubic root of 218335401 is about 602.1546614611.

The spelling of 218335401 in words is "two hundred eighteen million, three hundred thirty-five thousand, four hundred one".