12400434432 has 108 divisors (see below), whose sum is σ = 36035883520. Its totient is φ = 4100834304.

The previous prime is 12400434419. The next prime is 12400434439. The reversal of 12400434432 is 23443400421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12400434396 and 12400434405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400434439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271419 + ... + 313797.

Almost surely, 2^12400434432 is an apocalyptic number.

12400434432 is a gapful number since it is divisible by the number (12) 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 12400434432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18017941760).

12400434432 is an abundant number, since it is smaller than the sum of its proper divisors (23635449088).

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

12400434432 is a wasteful number, since it uses less digits than its factorization.

12400434432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42528 (or 42511 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 12400434432 its reverse (23443400421), we get a palindrome (35843834853).

The spelling of 12400434432 in words is "twelve billion, four hundred million, four hundred thirty-four thousand, four hundred thirty-two".