12499918 has 4 divisors (see below), whose sum is σ = 18749880. Its totient is φ = 6249958.

The previous prime is 12499909. The next prime is 12499919. The reversal of 12499918 is 81999421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3124978 + ... + 3124981.

It is an arithmetic number, because the mean of its divisors is an integer number (4687470).

Almost surely, 2^12499918 is an apocalyptic number.

12499918 is a deficient number, since it is larger than the sum of its proper divisors (6249962).

12499918 is an equidigital number, since it uses as much as digits as its factorization.

12499918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249961.

The product of its digits is 46656, while the sum is 43.

The square root of 12499918 is about 3535.5223093625. The cubic root of 12499918 is about 232.0789341992.

The spelling of 12499918 in words is "twelve million, four hundred ninety-nine thousand, nine hundred eighteen".