138729142 has 4 divisors (see below), whose sum is σ = 208093716. Its totient is φ = 69364570.

The previous prime is 138729139. The next prime is 138729161. The reversal of 138729142 is 241927831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241927831 = 29 ⋅8342339.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34682284 + ... + 34682287.

It is an arithmetic number, because the mean of its divisors is an integer number (52023429).

Almost surely, 2^138729142 is an apocalyptic number.

138729142 is a deficient number, since it is larger than the sum of its proper divisors (69364574).

138729142 is an equidigital number, since it uses as much as digits as its factorization.

138729142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69364573.

The product of its digits is 24192, while the sum is 37.

The square root of 138729142 is about 11778.3335833215. Note that the first 3 decimals coincide. The cubic root of 138729142 is about 517.6734598647.

The spelling of 138729142 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, one hundred forty-two".