999425 has 12 divisors (see below), whose sum is σ = 1416576. Its totient is φ = 685200.

The previous prime is 999389. The next prime is 999431. The reversal of 999425 is 524999.

It is not a de Polignac number, because 999425 - 2⁸ = 999169 is a prime.

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, 2681 + ... + 3030.

It is an arithmetic number, because the mean of its divisors is an integer number (118048).

It is a Proth number, since it is equal to 61 ⋅ 2¹⁴ + 1 and 61 < 2¹⁴.

2⁹⁹⁹⁴²⁵ is an apocalyptic number.

It is an amenable number.

999425 is a deficient number, since it is larger than the sum of its proper divisors (417151).

999425 is a wasteful number, since it uses less digits than its factorization.

999425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728 (or 5723 counting only the distinct ones).

The product of its digits is 29160, while the sum is 38.

The square root of 999425 is about 999.7124586600. The cubic root of 999425 is about 99.9808296585.

The spelling of 999425 in words is "nine hundred ninety-nine thousand, four hundred twenty-five".