999504 has 60 divisors (see below), whose sum is σ = 3056352. Its totient is φ = 302400.

The previous prime is 999499. The next prime is 999521. The reversal of 999504 is 405999.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

999504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1269 + ... + 1899.

2⁹⁹⁹⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1528176).

999504 is an abundant number, since it is smaller than the sum of its proper divisors (2056848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999504 is a wasteful number, since it uses less digits than its factorization.

999504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 999504 is about 999.7519692404. The cubic root of 999504 is about 99.9834639324.

Subtracting from 999504 its reverse (405999), we obtain a triangular number (593505 = T₁₀₈₉).

The spelling of 999504 in words is "nine hundred ninety-nine thousand, five hundred four".