4009987 has 4 divisors (see below), whose sum is σ = 4025056. Its totient is φ = 3994920.

The previous prime is 4009939. The next prime is 4009991. The reversal of 4009987 is 7899004.

It is a happy number.

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 4009987 - 2¹⁵ = 3977219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4009787) 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, 7128 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (1006264).

Almost surely, 2^4009987 is an apocalyptic number.

4009987 is a deficient number, since it is larger than the sum of its proper divisors (15069).

4009987 is a wasteful number, since it uses less digits than its factorization.

4009987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15068.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 4009987 is about 2002.4951935023. The cubic root of 4009987 is about 158.8721068519.

It can be divided in two parts, 40099 and 87, that added together give a triangular number (40186 = T₂₈₃).

The spelling of 4009987 in words is "four million, nine thousand, nine hundred eighty-seven".