999942 has 8 divisors (see below), whose sum is σ = 1999896. Its totient is φ = 333312.

The previous prime is 999931. The next prime is 999953. The reversal of 999942 is 249999.

It is an interprime number because it is at equal distance from previous prime (999931) and next prime (999953).

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 junction number, because it is equal to n+sod(n) for n = 999894 and 999903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83323 + ... + 83334.

It is an arithmetic number, because the mean of its divisors is an integer number (249987).

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 product of its digits is 52488, while the sum is 42.

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".