138504870 has 288 divisors, whose sum is σ = 469087200. Its totient is φ = 28957824.

The previous prime is 138504857. The next prime is 138504881. The reversal of 138504870 is 78405831.

It is a congruent number.

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 143 ways as a sum of consecutive naturals, for example, 4776016 + ... + 4776044.

It is an arithmetic number, because the mean of its divisors is an integer number (1628775).

Almost surely, 2^138504870 is an apocalyptic number.

138504870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138504870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234543600).

138504870 is an abundant number, since it is smaller than the sum of its proper divisors (330582330).

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

138504870 is a wasteful number, since it uses less digits than its factorization.

138504870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 138504870 is about 11768.8092005946. The cubic root of 138504870 is about 517.3943493628.

The spelling of 138504870 in words is "one hundred thirty-eight million, five hundred four thousand, eight hundred seventy".