218397484 has 6 divisors (see below), whose sum is σ = 382195604. Its totient is φ = 109198740.

The previous prime is 218397481. The next prime is 218397499. The reversal of 218397484 is 484793812.

It is a super-2 number, since 2×218397484² = 95394922035060512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218397481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27299682 + ... + 27299689.

Almost surely, 2^218397484 is an apocalyptic number.

It is an amenable number.

218397484 is a deficient number, since it is larger than the sum of its proper divisors (163798120).

218397484 is a wasteful number, since it uses less digits than its factorization.

218397484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54599375 (or 54599373 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 218397484 is about 14778.2774368328. The cubic root of 218397484 is about 602.2117296613.

The spelling of 218397484 in words is "two hundred eighteen million, three hundred ninety-seven thousand, four hundred eighty-four".