12309905 has 8 divisors (see below), whose sum is σ = 14812200. Its totient is φ = 9821056.

The previous prime is 12309893. The next prime is 12309907. The reversal of 12309905 is 50990321.

It can be written as a sum of positive squares in 4 ways, for example, as 1227664 + 11082241 = 1108^2 + 3329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12309905 - 2⁴ = 12309889 is a prime.

It is a super-2 number, since 2×12309905² = 303067522218050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12309907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1220 + ... + 5109.

It is an arithmetic number, because the mean of its divisors is an integer number (1851525).

Almost surely, 2^12309905 is an apocalyptic number.

It is an amenable number.

12309905 is a deficient number, since it is larger than the sum of its proper divisors (2502295).

12309905 is an equidigital number, since it uses as much as digits as its factorization.

12309905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 12309905 is about 3508.5474202296. The cubic root of 12309905 is about 230.8969699766.

The spelling of 12309905 in words is "twelve million, three hundred nine thousand, nine hundred five".