13028381 has 4 divisors (see below), whose sum is σ = 13037472. Its totient is φ = 13019292.

The previous prime is 13028371. The next prime is 13028387. The reversal of 13028381 is 18382031.

13028381 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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13028381 - 2⁶ = 13028317 is a prime.

It is a super-2 number, since 2×13028381² = 339477422962322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13028381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13028387) 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, 1871 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (3259368).

Almost surely, 2^13028381 is an apocalyptic number.

It is an amenable number.

13028381 is a deficient number, since it is larger than the sum of its proper divisors (9091).

13028381 is an equidigital number, since it uses as much as digits as its factorization.

13028381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 13028381 is about 3609.4848662932. The cubic root of 13028381 is about 235.3044552480.

The spelling of 13028381 in words is "thirteen million, twenty-eight thousand, three hundred eighty-one".