40191535789944 has 256 divisors, whose sum is σ = 128312142336000. Its totient is φ = 10188587427840.

The previous prime is 40191535789943. The next prime is 40191535789957. The reversal of 40191535789944 is 44998753519104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40191535789943) 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, 13829472 + ... + 16481424.

It is an arithmetic number, because the mean of its divisors is an integer number (501219306000).

Almost surely, 2^{40191535789944} is an apocalyptic number.

40191535789944 is a gapful number since it is divisible by the number (44) 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 40191535789944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64156071168000).

40191535789944 is an abundant number, since it is smaller than the sum of its proper divisors (88120606546056).

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

40191535789944 is a wasteful number, since it uses less digits than its factorization.

40191535789944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652178 (or 2652174 counting only the distinct ones).

The product of its (nonzero) digits is 195955200, while the sum is 69.

The spelling of 40191535789944 in words is "forty trillion, one hundred ninety-one billion, five hundred thirty-five million, seven hundred eighty-nine thousand, nine hundred forty-four".