999992025 has 18 divisors (see below), whose sum is σ = 1791097230. Its totient is φ = 533328960.

The previous prime is 999992023. The next prime is 999992029. The reversal of 999992025 is 520299999.

It can be written as a sum of positive squares in 3 ways, for example, as 2442969 + 997549056 = 1563^2 + 31584^2 .

It is not a de Polignac number, because 999992025 - 2¹ = 999992023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999992023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2221980 + ... + 2222429.

Almost surely, 2^999992025 is an apocalyptic number.

It is an amenable number.

999992025 is a deficient number, since it is larger than the sum of its proper divisors (791105205).

999992025 is a wasteful number, since it uses less digits than its factorization.

999992025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444425 (or 4444417 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 999992025 is about 31622.6505056107. The cubic root of 999992025 is about 999.9973416596.

The spelling of 999992025 in words is "nine hundred ninety-nine million, nine hundred ninety-two thousand, twenty-five".