999999725 has 12 divisors (see below), whose sum is σ = 1247902644. Its totient is φ = 794901120.

The previous prime is 999999677. The next prime is 999999733. The reversal of 999999725 is 527999999.

It can be written as a sum of positive squares in 6 ways, for example, as 48841 + 999950884 = 221^2 + 31622^2 .

It is not a de Polignac number, because 999999725 - 2¹² = 999995629 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 11 ways as a sum of consecutive naturals, for example, 123464 + ... + 131313.

It is an arithmetic number, because the mean of its divisors is an integer number (103991887).

Almost surely, 2^999999725 is an apocalyptic number.

It is an amenable number.

999999725 is a deficient number, since it is larger than the sum of its proper divisors (247902919).

999999725 is a wasteful number, since it uses less digits than its factorization.

999999725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254944 (or 254939 counting only the distinct ones).

The product of its digits is 37200870, while the sum is 68.

The square root of 999999725 is about 31622.7722535517. The cubic root of 999999725 is about 999.9999083333. Note that the first 4 decimals are identical.

The spelling of 999999725 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred twenty-five".