999520 has 24 divisors (see below), whose sum is σ = 2361744. Its totient is φ = 399744.

The previous prime is 999499. The next prime is 999521. The reversal of 999520 is 25999.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2964 + ... + 3283.

It is an arithmetic number, because the mean of its divisors is an integer number (98406).

2⁹⁹⁹⁵²⁰ is an apocalyptic number.

It is an amenable number.

999520 is an abundant number, since it is smaller than the sum of its proper divisors (1362224).

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

999520 is a wasteful number, since it uses less digits than its factorization.

999520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6262 (or 6254 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 999520 is about 999.7599711931. The cubic root of 999520 is about 99.9839974393.

The spelling of 999520 in words is "nine hundred ninety-nine thousand, five hundred twenty".