12509818 has 8 divisors (see below), whose sum is σ = 19201248. Its totient is φ = 6109404.

The previous prime is 12509813. The next prime is 12509831. The reversal of 12509818 is 81890521.

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

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

It is not an unprimeable number, because it can be changed into a prime (12509813) 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, 72646 + ... + 72817.

It is an arithmetic number, because the mean of its divisors is an integer number (2400156).

Almost surely, 2^12509818 is an apocalyptic number.

12509818 is a deficient number, since it is larger than the sum of its proper divisors (6691430).

12509818 is a wasteful number, since it uses less digits than its factorization.

12509818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145508.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 12509818 is about 3536.9221082744. The cubic root of 12509818 is about 232.1401872716.

The spelling of 12509818 in words is "twelve million, five hundred nine thousand, eight hundred eighteen".