12018558 has 64 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 3497472.

The previous prime is 12018553. The next prime is 12018569. The reversal of 12018558 is 85581021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110208 + ... + 110316.

It is an arithmetic number, because the mean of its divisors is an integer number (427680).

Almost surely, 2^12018558 is an apocalyptic number.

12018558 is an abundant number, since it is smaller than the sum of its proper divisors (15352962).

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

12018558 is a wasteful number, since it uses less digits than its factorization.

12018558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 12018558 is about 3466.7791968915. The cubic root of 12018558 is about 229.0608077620.

Adding to 12018558 its reverse (85581021), we get a palindrome (97599579).

The spelling of 12018558 in words is "twelve million, eighteen thousand, five hundred fifty-eight".