218485474 has 16 divisors (see below), whose sum is σ = 336142296. Its totient is φ = 106444800.

The previous prime is 218485447. The next prime is 218485493. The reversal of 218485474 is 474584812.

It can be written as a sum of positive squares in 4 ways, for example, as 207216025 + 11269449 = 14395^2 + 3357^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218485474.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 107314 + ... + 109330.

Almost surely, 2^218485474 is an apocalyptic number.

218485474 is a deficient number, since it is larger than the sum of its proper divisors (117656822).

218485474 is a wasteful number, since it uses less digits than its factorization.

218485474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381.

The product of its digits is 286720, while the sum is 43.

The square root of 218485474 is about 14781.2541416485. The cubic root of 218485474 is about 602.2925936812.

The spelling of 218485474 in words is "two hundred eighteen million, four hundred eighty-five thousand, four hundred seventy-four".