13381729 has 4 divisors (see below), whose sum is σ = 13692976. Its totient is φ = 13070484.

The previous prime is 13381727. The next prime is 13381747. The reversal of 13381729 is 92718331.

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: 92718331 = 89 ⋅1041779.

It is a cyclic number.

It is not a de Polignac number, because 13381729 - 2¹ = 13381727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13381694 and 13381703.

It is not an unprimeable number, because it can be changed into a prime (13381727) 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, 155559 + ... + 155644.

It is an arithmetic number, because the mean of its divisors is an integer number (3423244).

Almost surely, 2^13381729 is an apocalyptic number.

It is an amenable number.

13381729 is a deficient number, since it is larger than the sum of its proper divisors (311247).

13381729 is an equidigital number, since it uses as much as digits as its factorization.

13381729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311246.

The product of its digits is 9072, while the sum is 34.

The square root of 13381729 is about 3658.1045638418. The cubic root of 13381729 is about 237.4127709212.

The spelling of 13381729 in words is "thirteen million, three hundred eighty-one thousand, seven hundred twenty-nine".