12399918 has 8 divisors (see below), whose sum is σ = 24799848. Its totient is φ = 4133304.

The previous prime is 12399901. The next prime is 12399923. The reversal of 12399918 is 81999321.

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

12399918 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 12399918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033321 + ... + 1033332.

It is an arithmetic number, because the mean of its divisors is an integer number (3099981).

Almost surely, 2^12399918 is an apocalyptic number.

12399918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12399918 is a wasteful number, since it uses less digits than its factorization.

12399918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066658.

The product of its digits is 34992, while the sum is 42.

The square root of 12399918 is about 3521.3517290950. The cubic root of 12399918 is about 231.4583952463.

The spelling of 12399918 in words is "twelve million, three hundred ninety-nine thousand, nine hundred eighteen".