12621582 has 40 divisors (see below), whose sum is σ = 29951856. Its totient is φ = 3958848.

The previous prime is 12621569. The next prime is 12621589. The reversal of 12621582 is 28512621.

It is a happy number.

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 (12621589) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 463 + ... + 5045.

Almost surely, 2^12621582 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12621582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14975928).

12621582 is an abundant number, since it is smaller than the sum of its proper divisors (17330274).

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

12621582 is a wasteful number, since it uses less digits than its factorization.

12621582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614 (or 4605 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 12621582 is about 3552.6865890478. The cubic root of 12621582 is about 232.8294600830.

It can be divided in two parts, 12621 and 582, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12621582 in words is "twelve million, six hundred twenty-one thousand, five hundred eighty-two".