12440381 has 2 divisors, whose sum is σ = 12440382. Its totient is φ = 12440380.

The previous prime is 12440371. The next prime is 12440411. The reversal of 12440381 is 18304421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 648025 = 3434^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440381 - 2⁶ = 12440317 is a prime.

It is a super-2 number, since 2×12440381² = 309526158850322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220190 + 6220191.

It is an arithmetic number, because the mean of its divisors is an integer number (6220191).

Almost surely, 2^12440381 is an apocalyptic number.

It is an amenable number.

12440381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440381 is an equidigital number, since it uses as much as digits as its factorization.

12440381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 12440381 is about 3527.0924286160. The cubic root of 12440381 is about 231.7098843398.

It can be divided in two parts, 12440 and 381, that added together give a palindrome (12821).

The spelling of 12440381 in words is "twelve million, four hundred forty thousand, three hundred eighty-one".