4487991 has 8 divisors (see below), whose sum is σ = 6008304. Its totient is φ = 2979840.

The previous prime is 4487969. The next prime is 4488007. The reversal of 4487991 is 1997844.

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

It is not a de Polignac number, because 4487991 - 2⁹ = 4487479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4487891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 3681.

It is an arithmetic number, because the mean of its divisors is an integer number (751038).

Almost surely, 2^4487991 is an apocalyptic number.

4487991 is a deficient number, since it is larger than the sum of its proper divisors (1520313).

4487991 is a wasteful number, since it uses less digits than its factorization.

4487991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081.

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

The square root of 4487991 is about 2118.4879041430. The cubic root of 4487991 is about 164.9493692220.

The spelling of 4487991 in words is "four million, four hundred eighty-seven thousand, nine hundred ninety-one".