138333973 has 8 divisors (see below), whose sum is σ = 143360280. Its totient is φ = 133324800.

The previous prime is 138333961. The next prime is 138334013. The reversal of 138333973 is 379333831.

It can be written as a sum of positive squares in 4 ways, for example, as 90212004 + 48121969 = 9498^2 + 6937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138333973 - 2²⁵ = 104779541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138333953) 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, 13461 + ... + 21397.

It is an arithmetic number, because the mean of its divisors is an integer number (17920035).

Almost surely, 2^138333973 is an apocalyptic number.

It is an amenable number.

138333973 is a deficient number, since it is larger than the sum of its proper divisors (5026307).

138333973 is an equidigital number, since it uses as much as digits as its factorization.

138333973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8567.

The product of its digits is 122472, while the sum is 40.

The square root of 138333973 is about 11761.5463694193. The cubic root of 138333973 is about 517.1814626635.

The spelling of 138333973 in words is "one hundred thirty-eight million, three hundred thirty-three thousand, nine hundred seventy-three".