13226381 has 4 divisors (see below), whose sum is σ = 15115872. Its totient is φ = 11336892.

The previous prime is 13226371. The next prime is 13226399. The reversal of 13226381 is 18362231.

13226381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18362231 = 433 ⋅42407.

It is a de Polignac number, because none of the positive numbers 2^k-13226381 is a prime.

It is a super-2 number, since 2×13226381² = 349874308714322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13226381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13226351) 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, 944735 + ... + 944748.

It is an arithmetic number, because the mean of its divisors is an integer number (3778968).

Almost surely, 2^13226381 is an apocalyptic number.

It is an amenable number.

13226381 is a deficient number, since it is larger than the sum of its proper divisors (1889491).

13226381 is an equidigital number, since it uses as much as digits as its factorization.

13226381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889490.

The product of its digits is 1728, while the sum is 26.

The square root of 13226381 is about 3636.8091783870. The cubic root of 13226381 is about 236.4904873652.

The spelling of 13226381 in words is "thirteen million, two hundred twenty-six thousand, three hundred eighty-one".