218980485 has 24 divisors (see below), whose sum is σ = 401895000. Its totient is φ = 109919232.

The previous prime is 218980481. The next prime is 218980499. The reversal of 218980485 is 584089812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15233409 + 203747076 = 3903^2 + 14274^2 .

It is not a de Polignac number, because 218980485 - 2² = 218980481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 218980485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218980481) 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 23 ways as a sum of consecutive naturals, for example, 142360 + ... + 143889.

It is an arithmetic number, because the mean of its divisors is an integer number (16745625).

Almost surely, 2^218980485 is an apocalyptic number.

It is an amenable number.

218980485 is a deficient number, since it is larger than the sum of its proper divisors (182914515).

218980485 is a wasteful number, since it uses less digits than its factorization.

218980485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286277 (or 286274 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 218980485 is about 14797.9892215125. The cubic root of 218980485 is about 602.7471114355.

The spelling of 218980485 in words is "two hundred eighteen million, nine hundred eighty thousand, four hundred eighty-five".