12591018 has 96 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 3643200.

The previous prime is 12590987. The next prime is 12591023. The reversal of 12591018 is 81019521.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 12590982 and 12591000.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 267871 + ... + 267917.

It is an arithmetic number, because the mean of its divisors is an integer number (335160).

Almost surely, 2^12591018 is an apocalyptic number.

12591018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12591018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16087680).

12591018 is an abundant number, since it is smaller than the sum of its proper divisors (19584342).

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

12591018 is a wasteful number, since it uses less digits than its factorization.

12591018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12591018 is about 3548.3824483841. The cubic root of 12591018 is about 232.6413708383.

The spelling of 12591018 in words is "twelve million, five hundred ninety-one thousand, eighteen".