12399660 has 144 divisors (see below), whose sum is σ = 46353216. Its totient is φ = 2612736.

The previous prime is 12399649. The next prime is 12399677. The reversal of 12399660 is 6699321.

12399660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16002 + ... + 16758.

Almost surely, 2^12399660 is an apocalyptic number.

12399660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12399660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23176608).

12399660 is an abundant number, since it is smaller than the sum of its proper divisors (33953556).

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

12399660 is a wasteful number, since it uses less digits than its factorization.

12399660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 12399660 is about 3521.3150952450. The cubic root of 12399660 is about 231.4567899486.

The spelling of 12399660 in words is "twelve million, three hundred ninety-nine thousand, six hundred sixty".