218720401 has 8 divisors (see below), whose sum is σ = 220651200. Its totient is φ = 216797328.

The previous prime is 218720393. The next prime is 218720413. The reversal of 218720401 is 104027812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218720401 - 2³ = 218720393 is a prime.

It is a super-2 number, since 2×218720401² = 95677227627201602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218721401) 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 7 ways as a sum of consecutive naturals, for example, 64650 + ... + 67948.

It is an arithmetic number, because the mean of its divisors is an integer number (27581400).

Almost surely, 2^218720401 is an apocalyptic number.

It is an amenable number.

218720401 is a deficient number, since it is larger than the sum of its proper divisors (1930799).

218720401 is a wasteful number, since it uses less digits than its factorization.

218720401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 218720401 is about 14789.1987950666. The cubic root of 218720401 is about 602.5083885129.

The spelling of 218720401 in words is "two hundred eighteen million, seven hundred twenty thousand, four hundred one".