40181347640 has 64 divisors (see below), whose sum is σ = 104007836160. Its totient is φ = 13685212800.

The previous prime is 40181347639. The next prime is 40181347643. The reversal of 40181347640 is 4674318104.

It is a happy number.

It is a super-2 number, since 2×40181347640² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40181347594 and 40181347603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181347643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432902 + ... + 517461.

It is an arithmetic number, because the mean of its divisors is an integer number (1625122440).

Almost surely, 2^40181347640 is an apocalyptic number.

40181347640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40181347640 is an abundant number, since it is smaller than the sum of its proper divisors (63826488520).

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

40181347640 is a wasteful number, since it uses less digits than its factorization.

40181347640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950532 (or 950528 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 40181347640 in words is "forty billion, one hundred eighty-one million, three hundred forty-seven thousand, six hundred forty".