218785401 has 8 divisors (see below), whose sum is σ = 324126560. Its totient is φ = 145856916.

The previous prime is 218785387. The next prime is 218785421. The reversal of 218785401 is 104587812.

218785401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218785401 - 2⁶ = 218785337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218785421) 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, 4051555 + ... + 4051608.

It is an arithmetic number, because the mean of its divisors is an integer number (40515820).

Almost surely, 2^218785401 is an apocalyptic number.

It is an amenable number.

218785401 is a deficient number, since it is larger than the sum of its proper divisors (105341159).

218785401 is an equidigital number, since it uses as much as digits as its factorization.

218785401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103172 (or 8103166 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 218785401 is about 14791.3961815645. The cubic root of 218785401 is about 602.5680676987.

The spelling of 218785401 in words is "two hundred eighteen million, seven hundred eighty-five thousand, four hundred one".