999487 has 4 divisors (see below), whose sum is σ = 1008936. Its totient is φ = 990040.

The previous prime is 999451. The next prime is 999491. The reversal of 999487 is 784999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784999 = 307 ⋅2557.

It is a cyclic number.

It is not a de Polignac number, because 999487 - 2⁷ = 999359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4564 + ... + 4777.

It is an arithmetic number, because the mean of its divisors is an integer number (252234).

2⁹⁹⁹⁴⁸⁷ is an apocalyptic number.

999487 is a deficient number, since it is larger than the sum of its proper divisors (9449).

999487 is a wasteful number, since it uses less digits than its factorization.

999487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9448.

The product of its digits is 163296, while the sum is 46.

The square root of 999487 is about 999.7434670954. The cubic root of 999487 is about 99.9828970751.

The spelling of 999487 in words is "nine hundred ninety-nine thousand, four hundred eighty-seven".