999426 has 8 divisors (see below), whose sum is σ = 1998864. Its totient is φ = 333140.

The previous prime is 999389. The next prime is 999431. The reversal of 999426 is 624999.

It is a sphenic number, since it is the product of 3 distinct primes.

999426 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999426.

It is an unprimeable number.

999426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83280 + ... + 83291.

It is an arithmetic number, because the mean of its divisors is an integer number (249858).

2⁹⁹⁹⁴²⁶ is an apocalyptic number.

999426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999426 is a wasteful number, since it uses less digits than its factorization.

999426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166576.

The product of its digits is 34992, while the sum is 39.

The square root of 999426 is about 999.7129588037. The cubic root of 999426 is about 99.9808630047.

The spelling of 999426 in words is "nine hundred ninety-nine thousand, four hundred twenty-six".