13840065 has 28 divisors (see below), whose sum is σ = 24907284. Its totient is φ = 7379424.

The previous prime is 13840063. The next prime is 13840067. The reversal of 13840065 is 56004831.

13840065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13840063) and next prime (13840067).

It can be written as a sum of positive squares in 2 ways, for example, as 1896129 + 11943936 = 1377^2 + 3456^2 .

It is not a de Polignac number, because 13840065 - 2¹ = 13840063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13840061) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1747 + ... + 5543.

Almost surely, 2^13840065 is an apocalyptic number.

13840065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13840065 is a deficient number, since it is larger than the sum of its proper divisors (11067219).

13840065 is an frugal number, since it uses more digits than its factorization.

13840065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820 (or 3805 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 13840065 is about 3720.2237835915. The cubic root of 13840065 is about 240.0929327599.

Adding to 13840065 its reverse (56004831), we get a palindrome (69844896).

The spelling of 13840065 in words is "thirteen million, eight hundred forty thousand, sixty-five".