138258609 has 8 divisors (see below), whose sum is σ = 187823232. Its totient is φ = 90433200.

The previous prime is 138258583. The next prime is 138258613. The reversal of 138258609 is 906852831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138258609 - 2⁵ = 138258577 is a prime.

It is a super-2 number, since 2×138258609² = 38230885925229762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138258629) 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 7 ways as a sum of consecutive naturals, for example, 434617 + ... + 434934.

It is an arithmetic number, because the mean of its divisors is an integer number (23477904).

Almost surely, 2^138258609 is an apocalyptic number.

It is an amenable number.

138258609 is a deficient number, since it is larger than the sum of its proper divisors (49564623).

138258609 is an equidigital number, since it uses as much as digits as its factorization.

138258609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869607.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 138258609 is about 11758.3421025245. The cubic root of 138258609 is about 517.0875258833.

The spelling of 138258609 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, six hundred nine".