39987075 has 24 divisors (see below), whose sum is σ = 66299328. Its totient is φ = 21266080.

The previous prime is 39987071. The next prime is 39987089. The reversal of 39987075 is 57078993.

It is not a de Polignac number, because 39987075 - 2² = 39987071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39987071) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 41752 + ... + 42698.

It is an arithmetic number, because the mean of its divisors is an integer number (2762472).

Almost surely, 2^39987075 is an apocalyptic number.

39987075 is a deficient number, since it is larger than the sum of its proper divisors (26312253).

39987075 is a wasteful number, since it uses less digits than its factorization.

39987075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523 (or 1518 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 48.

The square root of 39987075 is about 6323.5334268113. The cubic root of 39987075 is about 341.9583496353.

It can be divided in two parts, 39 and 987075, that multiplied together give a triangular number (38495925 = T₈₇₇₄).

The spelling of 39987075 in words is "thirty-nine million, nine hundred eighty-seven thousand, seventy-five".