138225938 has 8 divisors (see below), whose sum is σ = 210179388. Its totient is φ = 68166144.

The previous prime is 138225907. The next prime is 138225943. The reversal of 138225938 is 839522831.

It can be written as a sum of positive squares in 2 ways, for example, as 124925329 + 13300609 = 11177^2 + 3647^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 138225895 and 138225904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473231 + ... + 473522.

Almost surely, 2^138225938 is an apocalyptic number.

138225938 is a deficient number, since it is larger than the sum of its proper divisors (71953450).

138225938 is an equidigital number, since it uses as much as digits as its factorization.

138225938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946828.

The product of its digits is 103680, while the sum is 41.

The square root of 138225938 is about 11756.9527514573. The cubic root of 138225938 is about 517.0467928021.

The spelling of 138225938 in words is "one hundred thirty-eight million, two hundred twenty-five thousand, nine hundred thirty-eight".