13640007 has 4 divisors (see below), whose sum is σ = 18186680. Its totient is φ = 9093336.

The previous prime is 13639993. The next prime is 13640009. The reversal of 13640007 is 70004631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13640007 - 2¹² = 13635911 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 (13640009) 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, 2273332 + ... + 2273337.

It is an arithmetic number, because the mean of its divisors is an integer number (4546670).

Almost surely, 2^13640007 is an apocalyptic number.

13640007 is a deficient number, since it is larger than the sum of its proper divisors (4546673).

13640007 is an equidigital number, since it uses as much as digits as its factorization.

13640007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546672.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 13640007 is about 3693.2380102019. The cubic root of 13640007 is about 238.9304665167.

Adding to 13640007 its reverse (70004631), we get a palindrome (83644638).

The spelling of 13640007 in words is "thirteen million, six hundred forty thousand, seven".