138915826 has 8 divisors (see below), whose sum is σ = 238141440. Its totient is φ = 59535348.

The previous prime is 138915787. The next prime is 138915827. The reversal of 138915826 is 628519831.

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

It is not an unprimeable number, because it can be changed into a prime (138915827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4961266 + ... + 4961293.

It is an arithmetic number, because the mean of its divisors is an integer number (29767680).

Almost surely, 2^138915826 is an apocalyptic number.

138915826 is a deficient number, since it is larger than the sum of its proper divisors (99225614).

138915826 is an equidigital number, since it uses as much as digits as its factorization.

138915826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922568.

The product of its digits is 103680, while the sum is 43.

The square root of 138915826 is about 11786.2558092042. The cubic root of 138915826 is about 517.9055621083.

The spelling of 138915826 in words is "one hundred thirty-eight million, nine hundred fifteen thousand, eight hundred twenty-six".