It is a sphenic number, since it is the product of 3 distinct primes.
999942 is an admirable number.
It is a nialpdrome in base 10.
It is a congruent number.
It is an unprimeable number.
2999942 is an apocalyptic number.
999942 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.
999942 is a wasteful number, since it uses less digits than its factorization.
999942 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 166662.
The square root of 999942 is about 999.9709995795. The cubic root of 999942 is about 99.9980666293.
The spelling of 999942 in words is "nine hundred ninety-nine thousand, nine hundred forty-two".