12961238400 has 576 divisors, whose sum is σ = 50964863040. Its totient is φ = 3110400000.

The previous prime is 12961238377. The next prime is 12961238401. The reversal of 12961238400 is 483216921.

12961238400 is a `hidden beast` number, since 1 + 2 + 9 + 612 + 38 + 4 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961238401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 51638275 + ... + 51638525.

It is an arithmetic number, because the mean of its divisors is an integer number (88480665).

Almost surely, 2^12961238400 is an apocalyptic number.

12961238400 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 12961238400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25482431520).

12961238400 is an abundant number, since it is smaller than the sum of its proper divisors (38003624640).

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

12961238400 is a wasteful number, since it uses less digits than its factorization.

12961238400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 12961238400 in words is "twelve billion, nine hundred sixty-one million, two hundred thirty-eight thousand, four hundred".