138673284 has 48 divisors (see below), whose sum is σ = 345860928. Its totient is φ = 43091968.

The previous prime is 138673277. The next prime is 138673307. The reversal of 138673284 is 482376831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18652 + ... + 25004.

It is an arithmetic number, because the mean of its divisors is an integer number (7205436).

Almost surely, 2^138673284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138673284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172930464).

138673284 is an abundant number, since it is smaller than the sum of its proper divisors (207187644).

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

138673284 is a wasteful number, since it uses less digits than its factorization.

138673284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484 (or 6482 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 138673284 is about 11775.9621262978. The cubic root of 138673284 is about 517.6039717347.

The spelling of 138673284 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, two hundred eighty-four".