43001000400000 has 768 divisors, whose sum is σ = 148645987297920. Its totient is φ = 11003351040000.

The previous prime is 43001000399941. The next prime is 43001000400013. The reversal of 43001000400000 is 400010034.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3241193367 + ... + 3241206633.

Almost surely, 2^{43001000400000} is an apocalyptic number.

43001000400000 is a gapful number since it is divisible by the number (40) 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 43001000400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74322993648960).

43001000400000 is an abundant number, since it is smaller than the sum of its proper divisors (105644986897920).

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

43001000400000 is an equidigital number, since it uses as much as digits as its factorization.

43001000400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13419 (or 13387 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 43001000400000 its reverse (400010034), we get a palindrome (43001400410034).

The spelling of 43001000400000 in words is "forty-three trillion, one billion, four hundred thousand".