91843400040 has 256 divisors, whose sum is σ = 332660736000. Its totient is φ = 19816151040.

The previous prime is 91843400039. The next prime is 91843400041. The reversal of 91843400040 is 4000434819.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91843400039) and next prime (91843400041).

It is a junction number, because it is equal to n+sod(n) for n = 91843399974 and 91843400010.

It is not an unprimeable number, because it can be changed into a prime (91843400041) 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, 4474521 + ... + 4494999.

It is an arithmetic number, because the mean of its divisors is an integer number (1299456000).

Almost surely, 2^91843400040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91843400040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166330368000).

91843400040 is an abundant number, since it is smaller than the sum of its proper divisors (240817335960).

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

91843400040 is a wasteful number, since it uses less digits than its factorization.

91843400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20800 (or 20796 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 91843400040 its reverse (4000434819), we get a palindrome (95843834859).

The spelling of 91843400040 in words is "ninety-one billion, eight hundred forty-three million, four hundred thousand, forty".