39905 has 8 divisors (see below), whose sum is σ = 50112. Its totient is φ = 30448.

The previous prime is 39901. The next prime is 39929. The reversal of 39905 is 50993.

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 39905 - 2² = 39901 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59 + ... + 288.

It is an arithmetic number, because the mean of its divisors is an integer number (6264).

2³⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

39905 is a deficient number, since it is larger than the sum of its proper divisors (10207).

39905 is a wasteful number, since it uses less digits than its factorization.

39905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375.

The product of its (nonzero) digits is 1215, while the sum is 26.

The square root of 39905 is about 199.7623588167. The cubic root of 39905 is about 34.1724228520.

The spelling of 39905 in words is "thirty-nine thousand, nine hundred five".