39915 has 12 divisors (see below), whose sum is σ = 69264. Its totient is φ = 21264.

The previous prime is 39901. The next prime is 39929. The reversal of 39915 is 51993.

It is an interprime number because it is at equal distance from previous prime (39901) and next prime (39929).

It is not a de Polignac number, because 39915 - 2⁵ = 39883 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

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 11 ways as a sum of consecutive naturals, for example, 399 + ... + 488.

It is an arithmetic number, because the mean of its divisors is an integer number (5772).

2³⁹⁹¹⁵ is an apocalyptic number.

39915 is a deficient number, since it is larger than the sum of its proper divisors (29349).

39915 is a wasteful number, since it uses less digits than its factorization.

39915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 895 counting only the distinct ones).

The product of its digits is 1215, while the sum is 27.

The square root of 39915 is about 199.7873869893. The cubic root of 39915 is about 34.1752770949.

It can be divided in two parts, 399 and 15, that added together give a palindrome (414).

The spelling of 39915 in words is "thirty-nine thousand, nine hundred fifteen".