13340731 has 4 divisors (see below), whose sum is σ = 13360464. Its totient is φ = 13321000.

The previous prime is 13340729. The next prime is 13340737. The reversal of 13340731 is 13704331.

It is a happy number.

13340731 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.

It is a cyclic number.

It is not a de Polignac number, because 13340731 - 2¹ = 13340729 is a prime.

It is a super-2 number, since 2×13340731² = 355950207228722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13340737) 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, 8815 + ... + 10216.

It is an arithmetic number, because the mean of its divisors is an integer number (3340116).

Almost surely, 2^13340731 is an apocalyptic number.

13340731 is a deficient number, since it is larger than the sum of its proper divisors (19733).

13340731 is an equidigital number, since it uses as much as digits as its factorization.

13340731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 13340731 is about 3652.4965434617. The cubic root of 13340731 is about 237.1700667097.

The spelling of 13340731 in words is "thirteen million, three hundred forty thousand, seven hundred thirty-one".