139123500 has 96 divisors (see below), whose sum is σ = 408687552. Its totient is φ = 36774400.

The previous prime is 139123459. The next prime is 139123513. The reversal of 139123500 is 5321931.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205162 + ... + 205838.

It is an arithmetic number, because the mean of its divisors is an integer number (4257162).

Almost surely, 2^139123500 is an apocalyptic number.

139123500 is a gapful number since it is divisible by the number (10) 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 139123500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204343776).

139123500 is an abundant number, since it is smaller than the sum of its proper divisors (269564052).

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

139123500 is a wasteful number, since it uses less digits than its factorization.

139123500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 139123500 is about 11795.0625263285. The cubic root of 139123500 is about 518.1635167996.

The spelling of 139123500 in words is "one hundred thirty-nine million, one hundred twenty-three thousand, five hundred".