12399240 has 128 divisors (see below), whose sum is σ = 44064000. Its totient is φ = 2731008.

The previous prime is 12399199. The next prime is 12399251. The reversal of 12399240 is 4299321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12399198 and 12399207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24106 + ... + 24614.

It is an arithmetic number, because the mean of its divisors is an integer number (344250).

Almost surely, 2^12399240 is an apocalyptic number.

12399240 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 12399240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22032000).

12399240 is an abundant number, since it is smaller than the sum of its proper divisors (31664760).

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

12399240 is a wasteful number, since it uses less digits than its factorization.

12399240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 12399240 is about 3521.2554579297. The cubic root of 12399240 is about 231.4541766256.

The spelling of 12399240 in words is "twelve million, three hundred ninety-nine thousand, two hundred forty".