218903938 has 8 divisors (see below), whose sum is σ = 358206480. Its totient is φ = 99501780.

The previous prime is 218903897. The next prime is 218903969. The reversal of 218903938 is 839309812.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 218903894 and 218903903.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4975068 + ... + 4975111.

It is an arithmetic number, because the mean of its divisors is an integer number (44775810).

Almost surely, 2^218903938 is an apocalyptic number.

218903938 is a deficient number, since it is larger than the sum of its proper divisors (139302542).

218903938 is a wasteful number, since it uses less digits than its factorization.

218903938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9950192.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 218903938 is about 14795.4025967528. The cubic root of 218903938 is about 602.6768709903.

The spelling of 218903938 in words is "two hundred eighteen million, nine hundred three thousand, nine hundred thirty-eight".