138475393 has 4 divisors (see below), whose sum is σ = 158257600. Its totient is φ = 118693188.

The previous prime is 138475391. The next prime is 138475411. The reversal of 138475393 is 393574831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 393574831 = 13 ⋅30274987.

It is a cyclic number.

It is not a de Polignac number, because 138475393 - 2¹ = 138475391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138475391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9891093 + ... + 9891106.

It is an arithmetic number, because the mean of its divisors is an integer number (39564400).

Almost surely, 2^138475393 is an apocalyptic number.

It is an amenable number.

138475393 is a deficient number, since it is larger than the sum of its proper divisors (19782207).

138475393 is an equidigital number, since it uses as much as digits as its factorization.

138475393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19782206.

The product of its digits is 272160, while the sum is 43.

The square root of 138475393 is about 11767.5567982483. The cubic root of 138475393 is about 517.3576423134.

The spelling of 138475393 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, three hundred ninety-three".