138432479 has 8 divisors (see below), whose sum is σ = 147456288. Its totient is φ = 129506560.

The previous prime is 138432451. The next prime is 138432487. The reversal of 138432479 is 974234831.

138432479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138432479 - 2¹² = 138428383 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 (138432419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21542 + ... + 27219.

It is an arithmetic number, because the mean of its divisors is an integer number (18432036).

Almost surely, 2^138432479 is an apocalyptic number.

138432479 is a deficient number, since it is larger than the sum of its proper divisors (9023809).

138432479 is a wasteful number, since it uses less digits than its factorization.

138432479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48945.

The product of its digits is 145152, while the sum is 41.

The square root of 138432479 is about 11765.7332538181. The cubic root of 138432479 is about 517.3041931548.

The spelling of 138432479 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, four hundred seventy-nine".