138921546 has 8 divisors (see below), whose sum is σ = 277843104. Its totient is φ = 46307180.

The previous prime is 138921539. The next prime is 138921581. The reversal of 138921546 is 645129831.

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

138921546 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11576790 + ... + 11576801.

It is an arithmetic number, because the mean of its divisors is an integer number (34730388).

Almost surely, 2^138921546 is an apocalyptic number.

138921546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138921546 is a wasteful number, since it uses less digits than its factorization.

138921546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23153596.

The product of its digits is 51840, while the sum is 39.

The square root of 138921546 is about 11786.4984622236. The cubic root of 138921546 is about 517.9126704397.

The spelling of 138921546 in words is "one hundred thirty-eight million, nine hundred twenty-one thousand, five hundred forty-six".