39987161 has 4 divisors (see below), whose sum is σ = 40002000. Its totient is φ = 39972324.

The previous prime is 39987151. The next prime is 39987169. The reversal of 39987161 is 16178993.

39987161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16178993 = 31 ⋅521903.

It is a cyclic number.

It is not a de Polignac number, because 39987161 - 2⁶ = 39987097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39987169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111 + ... + 9188.

It is an arithmetic number, because the mean of its divisors is an integer number (10000500).

Almost surely, 2^39987161 is an apocalyptic number.

It is an amenable number.

39987161 is a deficient number, since it is larger than the sum of its proper divisors (14839).

39987161 is a wasteful number, since it uses less digits than its factorization.

39987161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14838.

The product of its digits is 81648, while the sum is 44.

The square root of 39987161 is about 6323.5402268033. The cubic root of 39987161 is about 341.9585947844.

The spelling of 39987161 in words is "thirty-nine million, nine hundred eighty-seven thousand, one hundred sixty-one".