999975 has 24 divisors (see below), whose sum is σ = 1686400. Its totient is φ = 522720.

The previous prime is 999961. The next prime is 999979. The reversal of 999975 is 579999.

999975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999975 - 2⁴ = 999959 is a prime.

It is an Ulam number.

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 (999979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4926 + ... + 5124.

2⁹⁹⁹⁹⁷⁵ is an apocalyptic number.

999975 is a deficient number, since it is larger than the sum of its proper divisors (686425).

999975 is a wasteful number, since it uses less digits than its factorization.

999975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 274 counting only the distinct ones).

The product of its digits is 229635, while the sum is 48.

The square root of 999975 is about 999.9874999219. The cubic root of 999975 is about 99.9991666597. Note that the first 3 decimals are identical.

The spelling of 999975 in words is "nine hundred ninety-nine thousand, nine hundred seventy-five".