999725 has 6 divisors (see below), whose sum is σ = 1239690. Its totient is φ = 799760.

The previous prime is 999721. The next prime is 999727. The reversal of 999725 is 527999.

999725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 3721 + 996004 = 61^2 + 998^2 .

It is not a de Polignac number, because 999725 - 2² = 999721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19970 + ... + 20019.

It is an arithmetic number, because the mean of its divisors is an integer number (206615).

2⁹⁹⁹⁷²⁵ is an apocalyptic number.

It is an amenable number.

999725 is a deficient number, since it is larger than the sum of its proper divisors (239965).

999725 is a wasteful number, since it uses less digits than its factorization.

999725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39999 (or 39994 counting only the distinct ones).

The product of its digits is 51030, while the sum is 41.

The square root of 999725 is about 999.8624905456. The cubic root of 999725 is about 99.9908324929.

The spelling of 999725 in words is "nine hundred ninety-nine thousand, seven hundred twenty-five".