138459407 has 4 divisors (see below), whose sum is σ = 146604096. Its totient is φ = 130314720.

The previous prime is 138459383. The next prime is 138459421. The reversal of 138459407 is 704954831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138459407 - 2¹² = 138455311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138459437) 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, 4072319 + ... + 4072352.

It is an arithmetic number, because the mean of its divisors is an integer number (36651024).

Almost surely, 2^138459407 is an apocalyptic number.

138459407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138459407 is a deficient number, since it is larger than the sum of its proper divisors (8144689).

138459407 is an equidigital number, since it uses as much as digits as its factorization.

138459407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8144688.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 138459407 is about 11766.8775382427. The cubic root of 138459407 is about 517.3377331262.

The spelling of 138459407 in words is "one hundred thirty-eight million, four hundred fifty-nine thousand, four hundred seven".