9138698856 has 128 divisors (see below), whose sum is σ = 29120102400. Its totient is φ = 2601305280.

The previous prime is 9138698839. The next prime is 9138698879. The reversal of 9138698856 is 6588968319.

9138698856 is a `hidden beast` number, since 91 + 386 + 98 + 85 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 9138698793 and 9138698802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 398601 + ... + 420903.

It is an arithmetic number, because the mean of its divisors is an integer number (227500800).

Almost surely, 2^9138698856 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 9138698856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14560051200).

9138698856 is an abundant number, since it is smaller than the sum of its proper divisors (19981403544).

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

9138698856 is a wasteful number, since it uses less digits than its factorization.

9138698856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22596 (or 22586 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The square root of 9138698856 is about 95596.5420713532. The cubic root of 9138698856 is about 2090.7147770009.

The spelling of 9138698856 in words is "nine billion, one hundred thirty-eight million, six hundred ninety-eight thousand, eight hundred fifty-six".