12399720 has 64 divisors (see below), whose sum is σ = 37463040. Its totient is φ = 3283200.

The previous prime is 12399697. The next prime is 12399727. The reversal of 12399720 is 2799321.

12399720 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12399727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22650 + ... + 23190.

It is an arithmetic number, because the mean of its divisors is an integer number (585360).

Almost surely, 2^12399720 is an apocalyptic number.

12399720 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 12399720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18731520).

12399720 is an abundant number, since it is smaller than the sum of its proper divisors (25063320).

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

12399720 is a wasteful number, since it uses less digits than its factorization.

12399720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 12399720 is about 3521.3236147790. The cubic root of 12399720 is about 231.4571632757.

The spelling of 12399720 in words is "twelve million, three hundred ninety-nine thousand, seven hundred twenty".