4491987 has 8 divisors (see below), whose sum is σ = 6001104. Its totient is φ = 2988768.

The previous prime is 4491953. The next prime is 4491989. The reversal of 4491987 is 7891944.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4491987 - 2¹² = 4487891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4491989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813 + ... + 3105.

It is an arithmetic number, because the mean of its divisors is an integer number (750138).

Almost surely, 2^4491987 is an apocalyptic number.

4491987 is a deficient number, since it is larger than the sum of its proper divisors (1509117).

4491987 is a wasteful number, since it uses less digits than its factorization.

4491987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949.

The product of its digits is 72576, while the sum is 42.

The square root of 4491987 is about 2119.4308198193. The cubic root of 4491987 is about 164.9983103592.

The spelling of 4491987 in words is "four million, four hundred ninety-one thousand, nine hundred eighty-seven".