138620305 has 8 divisors (see below), whose sum is σ = 166478400. Its totient is φ = 110806896.

The previous prime is 138620297. The next prime is 138620353. The reversal of 138620305 is 503026831.

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

It is a cyclic number.

It is not a de Polignac number, because 138620305 - 2³ = 138620297 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 3915 + ... + 17104.

It is an arithmetic number, because the mean of its divisors is an integer number (20809800).

Almost surely, 2^138620305 is an apocalyptic number.

It is an amenable number.

138620305 is a deficient number, since it is larger than the sum of its proper divisors (27858095).

138620305 is a wasteful number, since it uses less digits than its factorization.

138620305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22343.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138620305 is about 11773.7124561457. The cubic root of 138620305 is about 517.5380478766.

The spelling of 138620305 in words is "one hundred thirty-eight million, six hundred twenty thousand, three hundred five".