138191475 has 24 divisors (see below), whose sum is σ = 238413312. Its totient is φ = 70496800.

The previous prime is 138191369. The next prime is 138191477. The reversal of 138191475 is 574191831.

It is not a de Polignac number, because 138191475 - 2¹¹ = 138189427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138191477) 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 23 ways as a sum of consecutive naturals, for example, 38331 + ... + 41780.

It is an arithmetic number, because the mean of its divisors is an integer number (9933888).

Almost surely, 2^138191475 is an apocalyptic number.

138191475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138191475 is a deficient number, since it is larger than the sum of its proper divisors (100221837).

138191475 is a wasteful number, since it uses less digits than its factorization.

138191475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80147 (or 80142 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 138191475 is about 11755.4870167084. The cubic root of 138191475 is about 517.0038185602.

The spelling of 138191475 in words is "one hundred thirty-eight million, one hundred ninety-one thousand, four hundred seventy-five".