138729642 has 8 divisors (see below), whose sum is σ = 277459296. Its totient is φ = 46243212.

The previous prime is 138729631. The next prime is 138729667. The reversal of 138729642 is 246927831.

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

138729642 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 138729594 and 138729603.

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, 11560798 + ... + 11560809.

It is an arithmetic number, because the mean of its divisors is an integer number (34682412).

Almost surely, 2^138729642 is an apocalyptic number.

138729642 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.

138729642 is a wasteful number, since it uses less digits than its factorization.

138729642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23121612.

The product of its digits is 145152, while the sum is 42.

The square root of 138729642 is about 11778.3548087159. The cubic root of 138729642 is about 517.6740817874.

The spelling of 138729642 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, six hundred forty-two".