13397643 has 20 divisors (see below), whose sum is σ = 22873840. Its totient is φ = 7655472.

The previous prime is 13397621. The next prime is 13397647. The reversal of 13397643 is 34679331.

13397643 is a `hidden beast` number, since 1 + 3 + 3 + 9 + 7 + 643 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-13397643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13397598 and 13397607.

It is not an unprimeable number, because it can be changed into a prime (13397647) 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 19 ways as a sum of consecutive naturals, for example, 11248 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (1143692).

Almost surely, 2^13397643 is an apocalyptic number.

13397643 is a deficient number, since it is larger than the sum of its proper divisors (9476197).

13397643 is an equidigital number, since it uses as much as digits as its factorization.

13397643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23648 (or 23639 counting only the distinct ones).

The product of its digits is 40824, while the sum is 36.

The square root of 13397643 is about 3660.2790877200. The cubic root of 13397643 is about 237.5068467094.

The spelling of 13397643 in words is "thirteen million, three hundred ninety-seven thousand, six hundred forty-three".