138671973 has 16 divisors (see below), whose sum is σ = 224116800. Its totient is φ = 84043440.

The previous prime is 138671969. The next prime is 138671999. The reversal of 138671973 is 379176831.

It is not a de Polignac number, because 138671973 - 2² = 138671969 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138671933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233158 + ... + 233751.

It is an arithmetic number, because the mean of its divisors is an integer number (14007300).

Almost surely, 2^138671973 is an apocalyptic number.

It is an amenable number.

138671973 is a deficient number, since it is larger than the sum of its proper divisors (85444827).

138671973 is a wasteful number, since it uses less digits than its factorization.

138671973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466929 (or 466923 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 138671973 is about 11775.9064619247. The cubic root of 138671973 is about 517.6023406084.

The spelling of 138671973 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, nine hundred seventy-three".