38656918440 has 256 divisors, whose sum is σ = 149340672000. Its totient is φ = 8711297280.

The previous prime is 38656918427. The next prime is 38656918441. The reversal of 38656918440 is 4481965683.

38656918440 is a `hidden beast` number, since 38 + 6 + 569 + 1 + 8 + 4 + 40 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (38656918441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 500751 + ... + 572769.

It is an arithmetic number, because the mean of its divisors is an integer number (583362000).

Almost surely, 2^38656918440 is an apocalyptic number.

38656918440 is a gapful number since it is divisible by the number (30) 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 38656918440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74670336000).

38656918440 is an abundant number, since it is smaller than the sum of its proper divisors (110683753560).

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

38656918440 is a wasteful number, since it uses less digits than its factorization.

38656918440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72117 (or 72107 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 38656918440 in words is "thirty-eight billion, six hundred fifty-six million, nine hundred eighteen thousand, four hundred forty".