138808605 has 16 divisors (see below), whose sum is σ = 239178240. Its totient is φ = 68336448.

The previous prime is 138808577. The next prime is 138808613. The reversal of 138808605 is 506808831.

It is a happy number.

It is not a de Polignac number, because 138808605 - 2⁶ = 138808541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 355725 + ... + 356114.

It is an arithmetic number, because the mean of its divisors is an integer number (14948640).

Almost surely, 2^138808605 is an apocalyptic number.

138808605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138808605 is a deficient number, since it is larger than the sum of its proper divisors (100369635).

138808605 is a wasteful number, since it uses less digits than its factorization.

138808605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711860.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 138808605 is about 11781.7063704711. The cubic root of 138808605 is about 517.7722808092.

The spelling of 138808605 in words is "one hundred thirty-eight million, eight hundred eight thousand, six hundred five".