999999425 has 12 divisors (see below), whose sum is σ = 1240662780. Its totient is φ = 799571520.

The previous prime is 999999391. The next prime is 999999433. The reversal of 999999425 is 524999999.

It can be written as a sum of positive squares in 6 ways, for example, as 3713329 + 996286096 = 1927^2 + 31564^2 .

It is not a de Polignac number, because 999999425 - 2¹⁴ = 999983041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42059 + ... + 61391.

It is an arithmetic number, because the mean of its divisors is an integer number (103388565).

Almost surely, 2^999999425 is an apocalyptic number.

It is an amenable number.

999999425 is a deficient number, since it is larger than the sum of its proper divisors (240663355).

999999425 is a wasteful number, since it uses less digits than its factorization.

999999425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21412 (or 21407 counting only the distinct ones).

The product of its digits is 21257640, while the sum is 65.

The square root of 999999425 is about 31622.7675101342. The cubic root of 999999425 is about 999.9998083333. Note that the first 3 decimals are identical.

The spelling of 999999425 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-five".