3987047 has 4 divisors (see below), whose sum is σ = 3999216. Its totient is φ = 3974880.

The previous prime is 3987037. The next prime is 3987077. The reversal of 3987047 is 7407893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3987047 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 3987047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987037) 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, 5579 + ... + 6252.

It is an arithmetic number, because the mean of its divisors is an integer number (999804).

Almost surely, 2^3987047 is an apocalyptic number.

3987047 is a deficient number, since it is larger than the sum of its proper divisors (12169).

3987047 is a wasteful number, since it uses less digits than its factorization.

3987047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12168.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 3987047 is about 1996.7591241810. The cubic root of 3987047 is about 158.5685731936.

The spelling of 3987047 in words is "three million, nine hundred eighty-seven thousand, forty-seven".