138915233 has 4 divisors (see below), whose sum is σ = 139847700. Its totient is φ = 137982768.

The previous prime is 138915229. The next prime is 138915253. The reversal of 138915233 is 332519831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72199009 + 66716224 = 8497^2 + 8168^2 .

It is a cyclic number.

It is not a de Polignac number, because 138915233 - 2² = 138915229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138915193 and 138915202.

It is not an unprimeable number, because it can be changed into a prime (138915253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466010 + ... + 466307.

It is an arithmetic number, because the mean of its divisors is an integer number (34961925).

Almost surely, 2^138915233 is an apocalyptic number.

It is an amenable number.

138915233 is a deficient number, since it is larger than the sum of its proper divisors (932467).

138915233 is an equidigital number, since it uses as much as digits as its factorization.

138915233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932466.

The product of its digits is 19440, while the sum is 35.

The square root of 138915233 is about 11786.2306527575. The cubic root of 138915233 is about 517.9048251670.

The spelling of 138915233 in words is "one hundred thirty-eight million, nine hundred fifteen thousand, two hundred thirty-three".