12240409 has 2 divisors, whose sum is σ = 12240410. Its totient is φ = 12240408.

The previous prime is 12240401. The next prime is 12240413. The reversal of 12240409 is 90404221.

12240409 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8573184 + 3667225 = 2928^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 12240409 - 2³ = 12240401 is a prime.

It is a super-2 number, since 2×12240409² = 299655224974562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12240409.

It is not a weakly prime, because it can be changed into another prime (12240401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6120204 + 6120205.

It is an arithmetic number, because the mean of its divisors is an integer number (6120205).

Almost surely, 2^12240409 is an apocalyptic number.

It is an amenable number.

12240409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12240409 is an equidigital number, since it uses as much as digits as its factorization.

12240409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12240409 is about 3498.6295888533. The cubic root of 12240409 is about 230.4616374061.

The spelling of 12240409 in words is "twelve million, two hundred forty thousand, four hundred nine".