12051558 has 32 divisors (see below), whose sum is σ = 27189120. Its totient is φ = 3956040.

The previous prime is 12051553. The next prime is 12051577. The reversal of 12051558 is 85515021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12051553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1953 + ... + 5283.

It is an arithmetic number, because the mean of its divisors is an integer number (849660).

Almost surely, 2^12051558 is an apocalyptic number.

12051558 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 12051558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13594560).

12051558 is an abundant number, since it is smaller than the sum of its proper divisors (15137562).

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

12051558 is a wasteful number, since it uses less digits than its factorization.

12051558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409 (or 3403 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 12051558 is about 3471.5353951818. The cubic root of 12051558 is about 229.2702643596.

Adding to 12051558 its reverse (85515021), we get a palindrome (97566579).

The spelling of 12051558 in words is "twelve million, fifty-one thousand, five hundred fifty-eight".