12001000400 has 240 divisors, whose sum is σ = 33253675200. Its totient is φ = 4131348480.

The previous prime is 12001000387. The next prime is 12001000409. The reversal of 12001000400 is 400010021.

12001000400 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 (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001000409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3745199 + ... + 3748401.

It is an arithmetic number, because the mean of its divisors is an integer number (138556980).

Almost surely, 2^12001000400 is an apocalyptic number.

12001000400 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 12001000400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16626837600).

12001000400 is an abundant number, since it is smaller than the sum of its proper divisors (21252674800).

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

12001000400 is a wasteful number, since it uses less digits than its factorization.

12001000400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 12001000400 its reverse (400010021), we get a palindrome (12401010421).

The spelling of 12001000400 in words is "twelve billion, one million, four hundred", and thus it is an aban number.