138475887 has 8 divisors (see below), whose sum is σ = 201419520. Its totient is φ = 83924760.

The previous prime is 138475879. The next prime is 138475903. The reversal of 138475887 is 788574831.

138475887 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 not a de Polignac number, because 138475887 - 2³ = 138475879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138475187) 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, 2098087 + ... + 2098152.

It is an arithmetic number, because the mean of its divisors is an integer number (25177440).

Almost surely, 2^138475887 is an apocalyptic number.

138475887 is a deficient number, since it is larger than the sum of its proper divisors (62943633).

138475887 is a wasteful number, since it uses less digits than its factorization.

138475887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196253.

The product of its digits is 1505280, while the sum is 51.

The square root of 138475887 is about 11767.5777881431. The cubic root of 138475887 is about 517.3582575235.

The spelling of 138475887 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, eight hundred eighty-seven".