39987436 has 6 divisors (see below), whose sum is σ = 69978020. Its totient is φ = 19993716.

The previous prime is 39987407. The next prime is 39987449. The reversal of 39987436 is 63478993.

It is a self number, because there is not a number n which added to its sum of digits gives 39987436.

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 as a sum of consecutive naturals, namely, 4998426 + ... + 4998433.

Almost surely, 2^39987436 is an apocalyptic number.

It is an amenable number.

39987436 is a deficient number, since it is larger than the sum of its proper divisors (29990584).

39987436 is a wasteful number, since it uses less digits than its factorization.

39987436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9996863 (or 9996861 counting only the distinct ones).

The product of its digits is 979776, while the sum is 49.

The square root of 39987436 is about 6323.5619709148. The cubic root of 39987436 is about 341.9593786894.

The spelling of 39987436 in words is "thirty-nine million, nine hundred eighty-seven thousand, four hundred thirty-six".