12394538520 has 256 divisors, whose sum is σ = 47343744000. Its totient is φ = 2524870656.

The previous prime is 12394538509. The next prime is 12394538521. The reversal of 12394538520 is 2583549321.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12394538521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 297111 + ... + 336249.

It is an arithmetic number, because the mean of its divisors is an integer number (184936500).

Almost surely, 2^12394538520 is an apocalyptic number.

12394538520 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 12394538520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23671872000).

12394538520 is an abundant number, since it is smaller than the sum of its proper divisors (34949205480).

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

12394538520 is a wasteful number, since it uses less digits than its factorization.

12394538520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39202 (or 39198 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 12394538520 in words is "twelve billion, three hundred ninety-four million, five hundred thirty-eight thousand, five hundred twenty".