9999942 has 8 divisors (see below), whose sum is σ = 19999896. Its totient is φ = 3333312.

The previous prime is 9999937. The next prime is 9999943. The reversal of 9999942 is 2499999.

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

9999942 is an admirable number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833323 + ... + 833334.

It is an arithmetic number, because the mean of its divisors is an integer number (2499987).

Almost surely, 2^9999942 is an apocalyptic number.

9999942 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.

9999942 is a wasteful number, since it uses less digits than its factorization.

9999942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666662.

The product of its digits is 472392, while the sum is 51.

The square root of 9999942 is about 3162.2684895499. The cubic root of 9999942 is about 215.4430524783.

The spelling of 9999942 in words is "nine million, nine hundred ninety-nine thousand, nine hundred forty-two".