138432477 has 8 divisors (see below), whose sum is σ = 185709664. Its totient is φ = 91721808.

The previous prime is 138432451. The next prime is 138432487. The reversal of 138432477 is 774234831.

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

It is a de Polignac number, because none of the positive numbers 2^k-138432477 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 (138432487) 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 in 7 ways as a sum of consecutive naturals, for example, 141058 + ... + 142035.

It is an arithmetic number, because the mean of its divisors is an integer number (23213708).

Almost surely, 2^138432477 is an apocalyptic number.

It is an amenable number.

138432477 is a deficient number, since it is larger than the sum of its proper divisors (47277187).

138432477 is a wasteful number, since it uses less digits than its factorization.

138432477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283259.

The product of its digits is 112896, while the sum is 39.

The square root of 138432477 is about 11765.7331688255. The cubic root of 138432477 is about 517.3041906635.

The spelling of 138432477 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, four hundred seventy-seven".