138729212 has 24 divisors (see below), whose sum is σ = 245704704. Its totient is φ = 68532912.

The previous prime is 138729211. The next prime is 138729233. The reversal of 138729212 is 212927831.

138729212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138729211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175883 + ... + 176669.

It is an arithmetic number, because the mean of its divisors is an integer number (10237696).

Almost surely, 2^138729212 is an apocalyptic number.

It is an amenable number.

138729212 is a deficient number, since it is larger than the sum of its proper divisors (106975492).

138729212 is a wasteful number, since it uses less digits than its factorization.

138729212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1263 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 138729212 is about 11778.3365548790. The cubic root of 138729212 is about 517.6735469340.

The spelling of 138729212 in words is "one hundred thirty-eight million, seven hundred twenty-nine thousand, two hundred twelve".