39987424 has 24 divisors (see below), whose sum is σ = 79023168. Its totient is φ = 19918080.

The previous prime is 39987407. The next prime is 39987449. The reversal of 39987424 is 42478993.

It is a happy number.

It is a congruent number.

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, 6769 + ... + 11215.

It is an arithmetic number, because the mean of its divisors is an integer number (3292632).

Almost surely, 2^39987424 is an apocalyptic number.

It is an amenable number.

39987424 is a deficient number, since it is larger than the sum of its proper divisors (39035744).

39987424 is a wasteful number, since it uses less digits than its factorization.

39987424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738 (or 4730 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 39987424 is about 6323.5610220824. The cubic root of 39987424 is about 341.9593444827.

The spelling of 39987424 in words is "thirty-nine million, nine hundred eighty-seven thousand, four hundred twenty-four".