138578926 has 4 divisors (see below), whose sum is σ = 207868392. Its totient is φ = 69289462.

The previous prime is 138578899. The next prime is 138578927. The reversal of 138578926 is 629875831.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 138578926.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138578927) 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 as a sum of consecutive naturals, namely, 34644730 + ... + 34644733.

It is an arithmetic number, because the mean of its divisors is an integer number (51967098).

Almost surely, 2^138578926 is an apocalyptic number.

138578926 is a deficient number, since it is larger than the sum of its proper divisors (69289466).

138578926 is an equidigital number, since it uses as much as digits as its factorization.

138578926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69289465.

The product of its digits is 725760, while the sum is 49.

The square root of 138578926 is about 11771.9550627753. The cubic root of 138578926 is about 517.4865466720.

The spelling of 138578926 in words is "one hundred thirty-eight million, five hundred seventy-eight thousand, nine hundred twenty-six".