12540469 has 2 divisors, whose sum is σ = 12540470. Its totient is φ = 12540468.

The previous prime is 12540467. The next prime is 12540491. The reversal of 12540469 is 96404521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11985444 + 555025 = 3462^2 + 745^2 .

It is an emirp because it is prime and its reverse (96404521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12540469 - 2¹ = 12540467 is a prime.

It is a super-2 number, since 2×12540469² = 314526725479922, which contains 22 as substring.

Together with 12540467, it forms a pair of twin primes.

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 12540469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12540467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270234 + 6270235.

It is an arithmetic number, because the mean of its divisors is an integer number (6270235).

Almost surely, 2^12540469 is an apocalyptic number.

It is an amenable number.

12540469 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540469 is an equidigital number, since it uses as much as digits as its factorization.

12540469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 12540469 is about 3541.2524620535. The cubic root of 12540469 is about 232.3296258272.

The spelling of 12540469 in words is "twelve million, five hundred forty thousand, four hundred sixty-nine".