138239475 has 36 divisors (see below), whose sum is σ = 251239128. Its totient is φ = 67020800.

The previous prime is 138239473. The next prime is 138239477. The reversal of 138239475 is 574932831.

138239475 = T₄₁₆ + T₄₁₇ + ... + T₉₆₅.

It is an interprime number because it is at equal distance from previous prime (138239473) and next prime (138239477).

It is not a de Polignac number, because 138239475 - 2¹ = 138239473 is a prime.

It is a super-2 number, since 2×138239475² = 38220304896551250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138239473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1459 + ... + 16691.

Almost surely, 2^138239475 is an apocalyptic number.

138239475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138239475 is a deficient number, since it is larger than the sum of its proper divisors (112999653).

138239475 is a wasteful number, since it uses less digits than its factorization.

138239475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15268 (or 15252 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 138239475 is about 11757.5284392597. The cubic root of 138239475 is about 517.0636710477.

The spelling of 138239475 in words is "one hundred thirty-eight million, two hundred thirty-nine thousand, four hundred seventy-five".