12213765 has 24 divisors (see below), whose sum is σ = 21491808. Its totient is φ = 6415200.

The previous prime is 12213739. The next prime is 12213779. The reversal of 12213765 is 56731221.

It is a happy number.

12213765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12213765 - 2¹³ = 12205573 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 990 + ... + 5040.

It is an arithmetic number, because the mean of its divisors is an integer number (895492).

Almost surely, 2^12213765 is an apocalyptic number.

12213765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12213765 is a deficient number, since it is larger than the sum of its proper divisors (9278043).

12213765 is a wasteful number, since it uses less digits than its factorization.

12213765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4126 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 12213765 is about 3494.8197378406. The cubic root of 12213765 is about 230.2942987549.

Adding to 12213765 its reverse (56731221), we get a palindrome (68944986).

The spelling of 12213765 in words is "twelve million, two hundred thirteen thousand, seven hundred sixty-five".