618556 has 12 divisors (see below), whose sum is σ = 1101240. Its totient is φ = 303920.

The previous prime is 618547. The next prime is 618559. The reversal of 618556 is 655816.

It is a super-2 number, since 2×618556² = 765223050272, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (91770).

2⁶¹⁸⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

618556 is a deficient number, since it is larger than the sum of its proper divisors (482684).

618556 is a wasteful number, since it uses less digits than its factorization.

618556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684 (or 2682 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 618556 is about 786.4833119654. The cubic root of 618556 is about 85.2039393654.

It can be divided in two parts, 6185 and 56, that added together give a square (6241 = 79²).

The spelling of 618556 in words is "six hundred eighteen thousand, five hundred fifty-six".