138476789 has 4 divisors (see below), whose sum is σ = 151065600. Its totient is φ = 125887980.

The previous prime is 138476773. The next prime is 138476837. The reversal of 138476789 is 987674831.

138476789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138476789 - 2⁴ = 138476773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138476789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138476729) 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, 6294389 + ... + 6294410.

It is an arithmetic number, because the mean of its divisors is an integer number (37766400).

Almost surely, 2^138476789 is an apocalyptic number.

It is an amenable number.

138476789 is a deficient number, since it is larger than the sum of its proper divisors (12588811).

138476789 is a wasteful number, since it uses less digits than its factorization.

138476789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12588810.

The product of its digits is 2032128, while the sum is 53.

The square root of 138476789 is about 11767.6161137250. The cubic root of 138476789 is about 517.3593808385.

The spelling of 138476789 in words is "one hundred thirty-eight million, four hundred seventy-six thousand, seven hundred eighty-nine".