40839871644 has 216 divisors, whose sum is σ = 125621710032. Its totient is φ = 11028648960.

The previous prime is 40839871637. The next prime is 40839871649. The reversal of 40839871644 is 44617893804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40839871649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4324752 + ... + 4334184.

Almost surely, 2^40839871644 is an apocalyptic number.

40839871644 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 40839871644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62810855016).

40839871644 is an abundant number, since it is smaller than the sum of its proper divisors (84781838388).

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

40839871644 is a wasteful number, since it uses less digits than its factorization.

40839871644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525 (or 9491 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 40839871644 in words is "forty billion, eight hundred thirty-nine million, eight hundred seventy-one thousand, six hundred forty-four".