13640465 has 8 divisors (see below), whose sum is σ = 16896768. Its totient is φ = 10560240.

The previous prime is 13640453. The next prime is 13640479. The reversal of 13640465 is 56404631.

It is a happy number.

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

It is not a de Polignac number, because 13640465 - 2⁶ = 13640401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43847 + ... + 44156.

It is an arithmetic number, because the mean of its divisors is an integer number (2112096).

Almost surely, 2^13640465 is an apocalyptic number.

It is an amenable number.

13640465 is a deficient number, since it is larger than the sum of its proper divisors (3256303).

13640465 is an equidigital number, since it uses as much as digits as its factorization.

13640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88039.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 13640465 is about 3693.3000148918. The cubic root of 13640465 is about 238.9331407316.

The spelling of 13640465 in words is "thirteen million, six hundred forty thousand, four hundred sixty-five".