138225939 has 8 divisors (see below), whose sum is σ = 187322832. Its totient is φ = 90639840.

The previous prime is 138225907. The next prime is 138225943. The reversal of 138225939 is 939522831.

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

It is not a de Polignac number, because 138225939 - 2⁵ = 138225907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138225939.

It is not an unprimeable number, because it can be changed into a prime (138225949) 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, 377484 + ... + 377849.

It is an arithmetic number, because the mean of its divisors is an integer number (23415354).

Almost surely, 2^138225939 is an apocalyptic number.

138225939 is a deficient number, since it is larger than the sum of its proper divisors (49096893).

138225939 is an equidigital number, since it uses as much as digits as its factorization.

138225939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755397.

The product of its digits is 116640, while the sum is 42.

The square root of 138225939 is about 11756.9527939854. The cubic root of 138225939 is about 517.0467940490.

The spelling of 138225939 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, nine hundred thirty-nine".