218955407 has 8 divisors (see below), whose sum is σ = 239254992. Its totient is φ = 198721600.

The previous prime is 218955403. The next prime is 218955419. The reversal of 218955407 is 704559812.

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

It is not a de Polignac number, because 218955407 - 2² = 218955403 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 (218955403) 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 7 ways as a sum of consecutive naturals, for example, 9344 + ... + 22917.

It is an arithmetic number, because the mean of its divisors is an integer number (29906874).

Almost surely, 2^218955407 is an apocalyptic number.

218955407 is a deficient number, since it is larger than the sum of its proper divisors (20299585).

218955407 is a wasteful number, since it uses less digits than its factorization.

218955407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32889.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 218955407 is about 14797.1418523984. The cubic root of 218955407 is about 602.7241013651.

The spelling of 218955407 in words is "two hundred eighteen million, nine hundred fifty-five thousand, four hundred seven".