138930534 has 48 divisors (see below), whose sum is σ = 318475872. Its totient is φ = 43680384.

The previous prime is 138930529. The next prime is 138930541. The reversal of 138930534 is 435039831.

138930534 is a `hidden beast` number, since 1 + 38 + 93 + 0 + 534 = 666.

138930534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27924 + ... + 32520.

It is an arithmetic number, because the mean of its divisors is an integer number (6634914).

Almost surely, 2^138930534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138930534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159237936).

138930534 is an abundant number, since it is smaller than the sum of its proper divisors (179545338).

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

138930534 is a wasteful number, since it uses less digits than its factorization.

138930534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701 (or 4698 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 138930534 is about 11786.8797397785. The cubic root of 138930534 is about 517.9238395703.

The spelling of 138930534 in words is "one hundred thirty-eight million, nine hundred thirty thousand, five hundred thirty-four".