13640393 has 16 divisors (see below), whose sum is σ = 15165696. Its totient is φ = 12191040.

The previous prime is 13640381. The next prime is 13640401. The reversal of 13640393 is 39304631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13640393 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13640593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81596 + ... + 81762.

It is an arithmetic number, because the mean of its divisors is an integer number (947856).

Almost surely, 2^13640393 is an apocalyptic number.

13640393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13640393 is a deficient number, since it is larger than the sum of its proper divisors (1525303).

13640393 is a wasteful number, since it uses less digits than its factorization.

13640393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 13640393 is about 3693.2902674986. The cubic root of 13640393 is about 238.9327203350.

The spelling of 13640393 in words is "thirteen million, six hundred forty thousand, three hundred ninety-three".