557218 has 4 divisors (see below), whose sum is σ = 835830. Its totient is φ = 278608.

The previous prime is 557201. The next prime is 557261. The reversal of 557218 is 812755.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 117649 = 663^2 + 343^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139303 + ... + 139306.

2⁵⁵⁷²¹⁸ is an apocalyptic number.

557218 is a deficient number, since it is larger than the sum of its proper divisors (278612).

557218 is a wasteful number, since it uses less digits than its factorization.

557218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278611.

The product of its digits is 2800, while the sum is 28.

The square root of 557218 is about 746.4703610995. The cubic root of 557218 is about 82.2889863002.

The spelling of 557218 in words is "five hundred fifty-seven thousand, two hundred eighteen".