999765625 has 32 divisors (see below), whose sum is σ = 1274996736. Its totient is φ = 783750000.

The previous prime is 999765577. The next prime is 999765649. The reversal of 999765625 is 526567999.

It is not a de Polignac number, because 999765625 - 2¹³ = 999757433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999765625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5234280 + ... + 5234470.

It is an arithmetic number, because the mean of its divisors is an integer number (39843648).

Almost surely, 2^999765625 is an apocalyptic number.

It is an amenable number.

999765625 is a deficient number, since it is larger than the sum of its proper divisors (275231111).

999765625 is an frugal number, since it uses more digits than its factorization.

999765625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 263 counting only the distinct ones).

The product of its digits is 9185400, while the sum is 58.

The square root of 999765625 is about 31619.0705903890. The cubic root of 999765625 is about 999.9218688957.

The spelling of 999765625 in words is "nine hundred ninety-nine million, seven hundred sixty-five thousand, six hundred twenty-five".