13640335 has 4 divisors (see below), whose sum is σ = 16368408. Its totient is φ = 10912264.

The previous prime is 13640321. The next prime is 13640339. The reversal of 13640335 is 53304631.

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 13640335 - 2¹⁵ = 13607567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640339) 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, 1364029 + ... + 1364038.

It is an arithmetic number, because the mean of its divisors is an integer number (4092102).

Almost surely, 2^13640335 is an apocalyptic number.

13640335 is a deficient number, since it is larger than the sum of its proper divisors (2728073).

13640335 is an equidigital number, since it uses as much as digits as its factorization.

13640335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728072.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 13640335 is about 3693.2824154132. The cubic root of 13640335 is about 238.9323816811.

Adding to 13640335 its reverse (53304631), we get a palindrome (66944966).

The spelling of 13640335 in words is "thirteen million, six hundred forty thousand, three hundred thirty-five".