138672436 has 12 divisors (see below), whose sum is σ = 277344928. Its totient is φ = 59431032.

The previous prime is 138672409. The next prime is 138672439. The reversal of 138672436 is 634276831.

138672436 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138672439) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2476266 + ... + 2476321.

Almost surely, 2^138672436 is an apocalyptic number.

It is an amenable number.

138672436 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.

138672436 is a wasteful number, since it uses less digits than its factorization.

138672436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952598 (or 4952596 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 138672436 is about 11775.9261206922. The cubic root of 138672436 is about 517.6029166672.

The spelling of 138672436 in words is "one hundred thirty-eight million, six hundred seventy-two thousand, four hundred thirty-six".