12622409 has 4 divisors (see below), whose sum is σ = 12630660. Its totient is φ = 12614160.

The previous prime is 12622387. The next prime is 12622417. The reversal of 12622409 is 90422621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90422621 = 7741 ⋅11681.

It can be written as a sum of positive squares in 2 ways, for example, as 6996025 + 5626384 = 2645^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 12622409 - 2⁸ = 12622153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12622429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082 + ... + 5139.

It is an arithmetic number, because the mean of its divisors is an integer number (3157665).

Almost surely, 2^12622409 is an apocalyptic number.

It is an amenable number.

12622409 is a deficient number, since it is larger than the sum of its proper divisors (8251).

12622409 is an equidigital number, since it uses as much as digits as its factorization.

12622409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 12622409 is about 3552.8029779316. The cubic root of 12622409 is about 232.8345451761.

It can be divided in two parts, 12622 and 409, that added together give a palindrome (13031).

The spelling of 12622409 in words is "twelve million, six hundred twenty-two thousand, four hundred nine".