138671964 has 36 divisors (see below), whose sum is σ = 350890176. Its totient is φ = 46176768.

The previous prime is 138671933. The next prime is 138671969. The reversal of 138671964 is 469176831.

It is a happy number.

138671964 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138671969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64572 + ... + 66684.

Almost surely, 2^138671964 is an apocalyptic number.

It is an amenable number.

138671964 is an abundant number, since it is smaller than the sum of its proper divisors (212218212).

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

138671964 is a wasteful number, since it uses less digits than its factorization.

138671964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946 (or 3941 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 138671964 is about 11775.9060797885. The cubic root of 138671964 is about 517.6023294107.

The spelling of 138671964 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, nine hundred sixty-four".