12440993 has 2 divisors, whose sum is σ = 12440994. Its totient is φ = 12440992.

The previous prime is 12440983. The next prime is 12441001. The reversal of 12440993 is 39904421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9935104 + 2505889 = 3152^2 + 1583^2 .

It is an emirp because it is prime and its reverse (39904421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12440993 - 2⁴ = 12440977 is a prime.

It is not a weakly prime, because it can be changed into another prime (12440983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220496 + 6220497.

It is an arithmetic number, because the mean of its divisors is an integer number (6220497).

Almost surely, 2^12440993 is an apocalyptic number.

It is an amenable number.

12440993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440993 is an equidigital number, since it uses as much as digits as its factorization.

12440993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 12440993 is about 3527.1791845609. The cubic root of 12440993 is about 231.7136839052.

The spelling of 12440993 in words is "twelve million, four hundred forty thousand, nine hundred ninety-three".