39890 has 8 divisors (see below), whose sum is σ = 71820. Its totient is φ = 15952.

The previous prime is 39887. The next prime is 39901. The reversal of 39890 is 9893.

It can be written as a sum of positive squares in 2 ways, for example, as 39601 + 289 = 199^2 + 17^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985 + ... + 2004.

2³⁹⁸⁹⁰ is an apocalyptic number.

39890 is a deficient number, since it is larger than the sum of its proper divisors (31930).

39890 is a wasteful number, since it uses less digits than its factorization.

39890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 39890 is about 199.7248106771. The cubic root of 39890 is about 34.1681405934.

It can be divided in two parts, 39 and 890, that added together give a palindrome (929).

The spelling of 39890 in words is "thirty-nine thousand, eight hundred ninety".