13308731 has 4 divisors (see below), whose sum is σ = 13388592. Its totient is φ = 13228872.

The previous prime is 13308719. The next prime is 13308751. The reversal of 13308731 is 13780331.

13308731 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 13308731 - 2⁶ = 13308667 is a prime.

It is a super-2 number, since 2×13308731² = 354244641660722, 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 13308731.

It is not an unprimeable number, because it can be changed into a prime (13308751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39680 + ... + 40013.

It is an arithmetic number, because the mean of its divisors is an integer number (3347148).

Almost surely, 2^13308731 is an apocalyptic number.

13308731 is a deficient number, since it is larger than the sum of its proper divisors (79861).

13308731 is an equidigital number, since it uses as much as digits as its factorization.

13308731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79860.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 13308731 is about 3648.1133480198. The cubic root of 13308731 is about 236.9802840453.

The spelling of 13308731 in words is "thirteen million, three hundred eight thousand, seven hundred thirty-one".