218978441 has 16 divisors (see below), whose sum is σ = 246067200. Its totient is φ = 193174800.

The previous prime is 218978429. The next prime is 218978443. The reversal of 218978441 is 144879812.

It is a cyclic number.

It is not a de Polignac number, because 218978441 - 2¹⁰ = 218977417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218978392 and 218978401.

It is not an unprimeable number, because it can be changed into a prime (218978443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49136 + ... + 53406.

It is an arithmetic number, because the mean of its divisors is an integer number (15379200).

Almost surely, 2^218978441 is an apocalyptic number.

It is an amenable number.

218978441 is a deficient number, since it is larger than the sum of its proper divisors (27088759).

218978441 is a wasteful number, since it uses less digits than its factorization.

218978441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420.

The product of its digits is 129024, while the sum is 44.

The square root of 218978441 is about 14797.9201579141. The cubic root of 218978441 is about 602.7452360493.

The spelling of 218978441 in words is "two hundred eighteen million, nine hundred seventy-eight thousand, four hundred forty-one".