487991 has 12 divisors (see below), whose sum is σ = 593712. Its totient is φ = 399168.

The previous prime is 487979. The next prime is 487997. The reversal of 487991 is 199784.

It is not a de Polignac number, because 487991 - 2¹⁴ = 471607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 911 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (49476).

2⁴⁸⁷⁹⁹¹ is an apocalyptic number.

487991 is a deficient number, since it is larger than the sum of its proper divisors (105721).

487991 is a wasteful number, since it uses less digits than its factorization.

487991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 463 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 487991 is about 698.5635261020. The cubic root of 487991 is about 78.7294596635.

The spelling of 487991 in words is "four hundred eighty-seven thousand, nine hundred ninety-one".