12443581 has 8 divisors (see below), whose sum is σ = 13221720. Its totient is φ = 11688768.

The previous prime is 12443551. The next prime is 12443591. The reversal of 12443581 is 18534421.

It can be written as a sum of positive squares in 4 ways, for example, as 6996025 + 5447556 = 2645^2 + 2334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12443581 - 2¹³ = 12435389 is a prime.

It is a super-2 number, since 2×12443581² = 309685416207122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4726 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (1652715).

Almost surely, 2^12443581 is an apocalyptic number.

It is an amenable number.

12443581 is a deficient number, since it is larger than the sum of its proper divisors (778139).

12443581 is a wasteful number, since it uses less digits than its factorization.

12443581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11663.

The product of its digits is 3840, while the sum is 28.

The square root of 12443581 is about 3527.5460308832. The cubic root of 12443581 is about 231.7297499710.

The spelling of 12443581 in words is "twelve million, four hundred forty-three thousand, five hundred eighty-one".