13640245 has 8 divisors (see below), whose sum is σ = 16749216. Its totient is φ = 10658256.

The previous prime is 13640213. The next prime is 13640257. The reversal of 13640245 is 54204631.

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

It is a cyclic number.

It is not a de Polignac number, because 13640245 - 2⁵ = 13640213 is a prime.

It is a Duffinian number.

It is a congruent 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, 31507 + ... + 31936.

It is an arithmetic number, because the mean of its divisors is an integer number (2093652).

Almost surely, 2^13640245 is an apocalyptic number.

It is an amenable number.

13640245 is a deficient number, since it is larger than the sum of its proper divisors (3108971).

13640245 is an equidigital number, since it uses as much as digits as its factorization.

13640245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63491.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 13640245 is about 3693.2702311096. The cubic root of 13640245 is about 238.9318561817.

Adding to 13640245 its reverse (54204631), we get a palindrome (67844876).

The spelling of 13640245 in words is "thirteen million, six hundred forty thousand, two hundred forty-five".