4390987 has 4 divisors (see below), whose sum is σ = 4423176. Its totient is φ = 4358800.

The previous prime is 4390937. The next prime is 4391003. The reversal of 4390987 is 7890934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890934 = 2 ⋅3945467.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4390987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4390937) 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, 15889 + ... + 16162.

It is an arithmetic number, because the mean of its divisors is an integer number (1105794).

Almost surely, 2^4390987 is an apocalyptic number.

4390987 is a deficient number, since it is larger than the sum of its proper divisors (32189).

4390987 is a wasteful number, since it uses less digits than its factorization.

4390987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32188.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 4390987 is about 2095.4682054376. The cubic root of 4390987 is about 163.7522906270.

The spelling of 4390987 in words is "four million, three hundred ninety thousand, nine hundred eighty-seven".