39988 has 12 divisors (see below), whose sum is σ = 75460.
Its totient is φ = 18432.
The previous prime is 39983. The next prime is 39989. The reversal of 39988 is 88993.
It can be written as a sum of positive squares in 2 ways, for example, as 10404 + 29584 = 102^2 + 172^2
It is an Ulam number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (39983) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333 + ... + 436.
239988 is an apocalyptic number.
It is an amenable number.
39988 is a deficient number, since it is larger than the sum of its proper divisors (35472).
39988 is a wasteful number, since it uses less digits than its factorization.
39988 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 786 (or 784 counting only the distinct ones).
The product of its digits is 15552, while the sum is 37.
The square root of 39988 is about 199.9699977497.
The cubic root of 39988 is about 34.1960986396.
The spelling of 39988 in words is "thirty-nine thousand, nine hundred eighty-eight".