999925 has 24 divisors (see below), whose sum is σ = 1357056. Its totient is φ = 728640.

The previous prime is 999917. The next prime is 999931. The reversal of 999925 is 529999.

999925 = T₁₂₆ + T₁₂₇ + ... + T₁₉₉.

It is not a de Polignac number, because 999925 - 2³ = 999917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21252 + ... + 21298.

It is an arithmetic number, because the mean of its divisors is an integer number (56544).

2⁹⁹⁹⁹²⁵ is an apocalyptic number.

It is an amenable number.

999925 is a deficient number, since it is larger than the sum of its proper divisors (357131).

999925 is a wasteful number, since it uses less digits than its factorization.

999925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 112 counting only the distinct ones).

The product of its digits is 65610, while the sum is 43.

The square root of 999925 is about 999.9624992968. The cubic root of 999925 is about 99.9974999375.

The spelling of 999925 in words is "nine hundred ninety-nine thousand, nine hundred twenty-five".