9978942 has 8 divisors (see below), whose sum is σ = 19957896. Its totient is φ = 3326312.

The previous prime is 9978919. The next prime is 9978959. The reversal of 9978942 is 2498799.

It is a happy number.

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

9978942 is an admirable number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9978891 and 9978900.

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, 831573 + ... + 831584.

It is an arithmetic number, because the mean of its divisors is an integer number (2494737).

Almost surely, 2^9978942 is an apocalyptic number.

9978942 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.

9978942 is a wasteful number, since it uses less digits than its factorization.

9978942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663162.

The product of its digits is 326592, while the sum is 48.

The square root of 9978942 is about 3158.9463433240. The cubic root of 9978942 is about 215.2921357752.

The spelling of 9978942 in words is "nine million, nine hundred seventy-eight thousand, nine hundred forty-two".