999247 has 4 divisors (see below), whose sum is σ = 1002240. Its totient is φ = 996256.

The previous prime is 999239. The next prime is 999269. The reversal of 999247 is 742999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999247 - 2³ = 999239 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 (999217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922 + ... + 1687.

It is an arithmetic number, because the mean of its divisors is an integer number (250560).

2⁹⁹⁹²⁴⁷ is an apocalyptic number.

999247 is a deficient number, since it is larger than the sum of its proper divisors (2993).

999247 is a wasteful number, since it uses less digits than its factorization.

999247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992.

The product of its digits is 40824, while the sum is 40.

The square root of 999247 is about 999.6234290972. The cubic root of 999247 is about 99.9748936973.

It can be divided in two parts, 999 and 247, that multiplied together give a triangular number (246753 = T₇₀₂).

The spelling of 999247 in words is "nine hundred ninety-nine thousand, two hundred forty-seven".