138715789 has 4 divisors (see below), whose sum is σ = 146016640. Its totient is φ = 131414940.

The previous prime is 138715781. The next prime is 138715799. The reversal of 138715789 is 987517831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987517831 = 29 ⋅34052339.

It is a cyclic number.

It is not a de Polignac number, because 138715789 - 2³ = 138715781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138715781) 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, 3650397 + ... + 3650434.

It is an arithmetic number, because the mean of its divisors is an integer number (36504160).

Almost surely, 2^138715789 is an apocalyptic number.

138715789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138715789 is a deficient number, since it is larger than the sum of its proper divisors (7300851).

138715789 is an equidigital number, since it uses as much as digits as its factorization.

138715789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300850.

The product of its digits is 423360, while the sum is 49.

The square root of 138715789 is about 11777.7667237894. The cubic root of 138715789 is about 517.6568502435.

The spelling of 138715789 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, seven hundred eighty-nine".