12723581 has 8 divisors (see below), whose sum is σ = 13741560. Its totient is φ = 11711232.

The previous prime is 12723569. The next prime is 12723583. The reversal of 12723581 is 18532721.

12723581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 184900 + 12538681 = 430^2 + 3541^2 .

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

It is not a de Polignac number, because 12723581 - 2⁶ = 12723517 is a prime.

It is a super-2 number, since 2×12723581² = 323779026927122, 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 (12723583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4121 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (1717695).

Almost surely, 2^12723581 is an apocalyptic number.

It is an amenable number.

12723581 is a deficient number, since it is larger than the sum of its proper divisors (1017979).

12723581 is a wasteful number, since it uses less digits than its factorization.

12723581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815.

The product of its digits is 3360, while the sum is 29.

The square root of 12723581 is about 3567.0128959677. The cubic root of 12723581 is about 233.4549676480.

The spelling of 12723581 in words is "twelve million, seven hundred twenty-three thousand, five hundred eighty-one".