218469474 has 20 divisors (see below), whose sum is σ = 489533814. Its totient is φ = 72823104.

The previous prime is 218469473. The next prime is 218469521. The reversal of 218469474 is 474964812.

It can be written as a sum of positive squares in only one way, i.e., 153586449 + 64883025 = 12393^2 + 8055^2 .

It is a super-2 number, since 2×218469474² = 95457822139673352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218469473) 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 9 ways as a sum of consecutive naturals, for example, 674127 + ... + 674450.

Almost surely, 2^218469474 is an apocalyptic number.

218469474 is an abundant number, since it is smaller than the sum of its proper divisors (271064340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218469474 is a wasteful number, since it uses less digits than its factorization.

218469474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348591 (or 1348582 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 218469474 is about 14780.7129056754. The cubic root of 218469474 is about 602.2778910764.

The spelling of 218469474 in words is "two hundred eighteen million, four hundred sixty-nine thousand, four hundred seventy-four".