14640209 has 4 divisors (see below), whose sum is σ = 14660916. Its totient is φ = 14619504.

The previous prime is 14640193. The next prime is 14640229. The reversal of 14640209 is 90204641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90204641 = 6269 ⋅14389.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 3717184 = 3305^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 14640209 - 2⁴ = 14640193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14640229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9254 + ... + 10719.

It is an arithmetic number, because the mean of its divisors is an integer number (3665229).

Almost surely, 2^14640209 is an apocalyptic number.

It is an amenable number.

14640209 is a deficient number, since it is larger than the sum of its proper divisors (20707).

14640209 is an equidigital number, since it uses as much as digits as its factorization.

14640209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20706.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 14640209 is about 3826.2526053568. The cubic root of 14640209 is about 244.6334042528.

The spelling of 14640209 in words is "fourteen million, six hundred forty thousand, two hundred nine".