12824381 has 4 divisors (see below), whose sum is σ = 12856764. Its totient is φ = 12792000.

The previous prime is 12824353. The next prime is 12824387. The reversal of 12824381 is 18342821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18342821 = 7 ⋅2620403.

It can be written as a sum of positive squares in 2 ways, for example, as 7344100 + 5480281 = 2710^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 12824381 - 2¹⁰ = 12823357 is a prime.

It is a super-2 number, since 2×12824381² = 328929496066322, 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 (12824387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15590 + ... + 16391.

It is an arithmetic number, because the mean of its divisors is an integer number (3214191).

Almost surely, 2^12824381 is an apocalyptic number.

It is an amenable number.

12824381 is a deficient number, since it is larger than the sum of its proper divisors (32383).

12824381 is an equidigital number, since it uses as much as digits as its factorization.

12824381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32382.

The product of its digits is 3072, while the sum is 29.

The square root of 12824381 is about 3581.1144913281. The cubic root of 12824381 is about 234.0698466829.

The spelling of 12824381 in words is "twelve million, eight hundred twenty-four thousand, three hundred eighty-one".