138479389 has 4 divisors (see below), whose sum is σ = 144500256. Its totient is φ = 132458524.

The previous prime is 138479359. The next prime is 138479401. The reversal of 138479389 is 983974831.

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 138479389 - 2⁷ = 138479261 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 (138479309) 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, 3010399 + ... + 3010444.

It is an arithmetic number, because the mean of its divisors is an integer number (36125064).

Almost surely, 2^138479389 is an apocalyptic number.

It is an amenable number.

138479389 is a deficient number, since it is larger than the sum of its proper divisors (6020867).

138479389 is an equidigital number, since it uses as much as digits as its factorization.

138479389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020866.

The product of its digits is 1306368, while the sum is 52.

The square root of 138479389 is about 11767.7265858789. The cubic root of 138479389 is about 517.3626187481.

The spelling of 138479389 in words is "one hundred thirty-eight million, four hundred seventy-nine thousand, three hundred eighty-nine".