13640343 has 8 divisors (see below), whose sum is σ = 18348528. Its totient is φ = 9012864.

The previous prime is 13640339. The next prime is 13640351. The reversal of 13640343 is 34304631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13640343 - 2² = 13640339 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19780 + ... + 20457.

It is an arithmetic number, because the mean of its divisors is an integer number (2293566).

Almost surely, 2^13640343 is an apocalyptic number.

13640343 is a deficient number, since it is larger than the sum of its proper divisors (4708185).

13640343 is a wasteful number, since it uses less digits than its factorization.

13640343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40353.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 13640343 is about 3693.2834984604. The cubic root of 13640343 is about 238.9324283920.

Adding to 13640343 its reverse (34304631), we get a palindrome (47944974).

The spelling of 13640343 in words is "thirteen million, six hundred forty thousand, three hundred forty-three".