39864487 has 4 divisors (see below), whose sum is σ = 42931000. Its totient is φ = 36797976.

The previous prime is 39864467. The next prime is 39864491. The reversal of 39864487 is 78446893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39864487 - 2¹⁹ = 39340199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39864487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39864457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533237 + ... + 1533262.

It is an arithmetic number, because the mean of its divisors is an integer number (10732750).

Almost surely, 2^39864487 is an apocalyptic number.

39864487 is a deficient number, since it is larger than the sum of its proper divisors (3066513).

39864487 is a wasteful number, since it uses less digits than its factorization.

39864487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066512.

The product of its digits is 1161216, while the sum is 49.

The square root of 39864487 is about 6313.8329879717. The cubic root of 39864487 is about 341.6085457617.

The spelling of 39864487 in words is "thirty-nine million, eight hundred sixty-four thousand, four hundred eighty-seven".