4243987 has 4 divisors (see below), whose sum is σ = 4629816. Its totient is φ = 3858160.

The previous prime is 4243979. The next prime is 4243991. The reversal of 4243987 is 7893424.

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 4243987 - 2³ = 4243979 is a prime.

It is a super-2 number, since 2×4243987² = 36022851312338, which contains 22 as substring.

It is a d-powerful number, because it can be written as 4³ + 2¹⁵ + 4¹¹ + 3³ + 9 + 8 + 7⁵ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4243927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192898 + ... + 192919.

It is an arithmetic number, because the mean of its divisors is an integer number (1157454).

Almost surely, 2^4243987 is an apocalyptic number.

4243987 is a deficient number, since it is larger than the sum of its proper divisors (385829).

4243987 is a wasteful number, since it uses less digits than its factorization.

4243987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385828.

The product of its digits is 48384, while the sum is 37.

The square root of 4243987 is about 2060.0939298974. The cubic root of 4243987 is about 161.9041626921.

The spelling of 4243987 in words is "four million, two hundred forty-three thousand, nine hundred eighty-seven".