13640365 has 4 divisors (see below), whose sum is σ = 16368444. Its totient is φ = 10912288.

The previous prime is 13640351. The next prime is 13640371. The reversal of 13640365 is 56304631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4748041 + 8892324 = 2179^2 + 2982^2 .

It is a cyclic number.

It is not a de Polignac number, because 13640365 - 2¹³ = 13632173 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 3 ways as a sum of consecutive naturals, for example, 1364032 + ... + 1364041.

It is an arithmetic number, because the mean of its divisors is an integer number (4092111).

Almost surely, 2^13640365 is an apocalyptic number.

It is an amenable number.

13640365 is a deficient number, since it is larger than the sum of its proper divisors (2728079).

13640365 is an equidigital number, since it uses as much as digits as its factorization.

13640365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728078.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 13640365 is about 3693.2864768388. The cubic root of 13640365 is about 238.9325568470.

Adding to 13640365 its reverse (56304631), we get a palindrome (69944996).

The spelling of 13640365 in words is "thirteen million, six hundred forty thousand, three hundred sixty-five".