138359520 has 288 divisors, whose sum is σ = 536608800. Its totient is φ = 32182272.

The previous prime is 138359503. The next prime is 138359527. The reversal of 138359520 is 25953831.

138359520 is a `hidden beast` number, since 1 + 3 + 83 + 59 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138359527) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 355486 + ... + 355874.

It is an arithmetic number, because the mean of its divisors is an integer number (1863225).

Almost surely, 2^138359520 is an apocalyptic number.

138359520 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 138359520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268304400).

138359520 is an abundant number, since it is smaller than the sum of its proper divisors (398249280).

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

138359520 is a wasteful number, since it uses less digits than its factorization.

138359520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 138359520 is about 11762.6323584477. The cubic root of 138359520 is about 517.2132977490.

The spelling of 138359520 in words is "one hundred thirty-eight million, three hundred fifty-nine thousand, five hundred twenty".