920917500138 has 48 divisors (see below), whose sum is σ = 2019102733440. Its totient is φ = 303318468288.

The previous prime is 920917500137. The next prime is 920917500161. The reversal of 920917500138 is 831005719029.

920917500138 is a `hidden beast` number, since 9 + 2 + 0 + 9 + 1 + 7 + 500 + 138 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 920917500093 and 920917500102.

It is not an unprimeable number, because it can be changed into a prime (920917500137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2188881 + ... + 2575467.

It is an arithmetic number, because the mean of its divisors is an integer number (42064640280).

Almost surely, 2^920917500138 is an apocalyptic number.

920917500138 is an abundant number, since it is smaller than the sum of its proper divisors (1098185233302).

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

920917500138 is a wasteful number, since it uses less digits than its factorization.

920917500138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388171 (or 388168 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 920917500138 in words is "nine hundred twenty billion, nine hundred seventeen million, five hundred thousand, one hundred thirty-eight".