138097808 has 40 divisors (see below), whose sum is σ = 277244160. Its totient is φ = 66568320.

The previous prime is 138097793. The next prime is 138097831. The reversal of 138097808 is 808790831.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 252191 + ... + 252737.

It is an arithmetic number, because the mean of its divisors is an integer number (6931104).

Almost surely, 2^138097808 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 138097808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138622080).

138097808 is an abundant number, since it is smaller than the sum of its proper divisors (139146352).

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

138097808 is a wasteful number, since it uses less digits than its factorization.

138097808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 138097808 is about 11751.5023720374. The cubic root of 138097808 is about 516.8869827424.

The spelling of 138097808 in words is "one hundred thirty-eight million, ninety-seven thousand, eight hundred eight".