13640515 has 16 divisors (see below), whose sum is σ = 19016640. Its totient is φ = 9198720.

The previous prime is 13640513. The next prime is 13640521. The reversal of 13640515 is 51504631.

It is not a de Polignac number, because 13640515 - 2¹ = 13640513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13640515.

It is not an unprimeable number, because it can be changed into a prime (13640513) 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, 1060 + ... + 5329.

It is an arithmetic number, because the mean of its divisors is an integer number (1188540).

Almost surely, 2^13640515 is an apocalyptic number.

13640515 is a deficient number, since it is larger than the sum of its proper divisors (5376125).

13640515 is an equidigital number, since it uses as much as digits as its factorization.

13640515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 13640515 is about 3693.3067838998. The cubic root of 13640515 is about 238.9334326729.

The spelling of 13640515 in words is "thirteen million, six hundred forty thousand, five hundred fifteen".