138505546 has 8 divisors (see below), whose sum is σ = 208919520. Its totient is φ = 68865708.

The previous prime is 138505513. The next prime is 138505559. The reversal of 138505546 is 645505831.

138505546 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 193086 + ... + 193801.

It is an arithmetic number, because the mean of its divisors is an integer number (26114940).

Almost surely, 2^138505546 is an apocalyptic number.

138505546 is a deficient number, since it is larger than the sum of its proper divisors (70413974).

138505546 is a wasteful number, since it uses less digits than its factorization.

138505546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387068.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 138505546 is about 11768.8379205425. The cubic root of 138505546 is about 517.3951911094.

The spelling of 138505546 in words is "one hundred thirty-eight million, five hundred five thousand, five hundred forty-six".