218705963 has 12 divisors (see below), whose sum is σ = 256671000. Its totient is φ = 185798592.

The previous prime is 218705957. The next prime is 218705983. The reversal of 218705963 is 369507812.

It is not a de Polignac number, because 218705963 - 2⁴ = 218705947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218705963.

It is not an unprimeable number, because it can be changed into a prime (218705983) 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 11 ways as a sum of consecutive naturals, for example, 14213 + ... + 25286.

It is an arithmetic number, because the mean of its divisors is an integer number (21389250).

Almost surely, 2^218705963 is an apocalyptic number.

218705963 is a deficient number, since it is larger than the sum of its proper divisors (37965037).

218705963 is a wasteful number, since it uses less digits than its factorization.

218705963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39626 (or 39619 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 218705963 is about 14788.7106605005. The cubic root of 218705963 is about 602.4951307837.

The spelling of 218705963 in words is "two hundred eighteen million, seven hundred five thousand, nine hundred sixty-three".