7218401 has 8 divisors (see below), whose sum is σ = 7409664. Its totient is φ = 7028800.

The previous prime is 7218397. The next prime is 7218403. The reversal of 7218401 is 1048127.

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 7218401 - 2² = 7218397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218403) 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, 17801 + ... + 18201.

It is an arithmetic number, because the mean of its divisors is an integer number (926208).

Almost surely, 2^7218401 is an apocalyptic number.

It is an amenable number.

7218401 is a deficient number, since it is larger than the sum of its proper divisors (191263).

7218401 is a wasteful number, since it uses less digits than its factorization.

7218401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 7218401 is about 2686.7082089427. The cubic root of 7218401 is about 193.2622367065.

The spelling of 7218401 in words is "seven million, two hundred eighteen thousand, four hundred one".