138421317 has 4 divisors (see below), whose sum is σ = 184561760. Its totient is φ = 92280876.

The previous prime is 138421313. The next prime is 138421331. The reversal of 138421317 is 713124831.

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.

It is not a de Polignac number, because 138421317 - 2² = 138421313 is a prime.

It is a super-2 number, since 2×138421317² = 38320922000028978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138421313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23070217 + ... + 23070222.

It is an arithmetic number, because the mean of its divisors is an integer number (46140440).

Almost surely, 2^138421317 is an apocalyptic number.

It is an amenable number.

138421317 is a deficient number, since it is larger than the sum of its proper divisors (46140443).

138421317 is an equidigital number, since it uses as much as digits as its factorization.

138421317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46140442.

The product of its digits is 4032, while the sum is 30.

The square root of 138421317 is about 11765.2589006787. The cubic root of 138421317 is about 517.2902891330.

The spelling of 138421317 in words is "one hundred thirty-eight million, four hundred twenty-one thousand, three hundred seventeen".