12440273 has 2 divisors, whose sum is σ = 12440274. Its totient is φ = 12440272.

The previous prime is 12440249. The next prime is 12440293. The reversal of 12440273 is 37204421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9560464 + 2879809 = 3092^2 + 1697^2 .

It is an emirp because it is prime and its reverse (37204421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12440273 - 2⁸ = 12440017 is a prime.

It is equal to p₈₁₅₀₇₂ and since 12440273 and 815072 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12440203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220136 + 6220137.

It is an arithmetic number, because the mean of its divisors is an integer number (6220137).

Almost surely, 2^12440273 is an apocalyptic number.

It is an amenable number.

12440273 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440273 is an equidigital number, since it uses as much as digits as its factorization.

12440273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 12440273 is about 3527.0771185218. The cubic root of 12440273 is about 231.7092138153.

Adding to 12440273 its reverse (37204421), we get a palindrome (49644694).

The spelling of 12440273 in words is "twelve million, four hundred forty thousand, two hundred seventy-three".