39138905 has 8 divisors (see below), whose sum is σ = 50579592. Its totient is φ = 28902528.

The previous prime is 39138863. The next prime is 39138919. The reversal of 39138905 is 50983193.

39138905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1369 + 39137536 = 37^2 + 6256^2 .

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 39138905 - 2²² = 34944601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 301004 + ... + 301133.

It is an arithmetic number, because the mean of its divisors is an integer number (6322449).

Almost surely, 2^39138905 is an apocalyptic number.

It is an amenable number.

39138905 is a deficient number, since it is larger than the sum of its proper divisors (11440687).

39138905 is a wasteful number, since it uses less digits than its factorization.

39138905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602155.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 39138905 is about 6256.1094140048. The cubic root of 39138905 is about 339.5232794134.

The spelling of 39138905 in words is "thirty-nine million, one hundred thirty-eight thousand, nine hundred five".