12909418 has 4 divisors (see below), whose sum is σ = 19364130. Its totient is φ = 6454708.

The previous prime is 12909397. The next prime is 12909427. The reversal of 12909418 is 81490921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81490921 = 991 ⋅82231.

It can be written as a sum of positive squares in only one way, i.e., 12866569 + 42849 = 3587^2 + 207^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3227353 + ... + 3227356.

Almost surely, 2^12909418 is an apocalyptic number.

12909418 is a deficient number, since it is larger than the sum of its proper divisors (6454712).

12909418 is an equidigital number, since it uses as much as digits as its factorization.

12909418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6454711.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 12909418 is about 3592.9678540171. The cubic root of 12909418 is about 234.5860707896.

The spelling of 12909418 in words is "twelve million, nine hundred nine thousand, four hundred eighteen".