9942840 has 96 divisors (see below), whose sum is σ = 32853600. Its totient is φ = 2607360.

The previous prime is 9942797. The next prime is 9942883. The reversal of 9942840 is 482499.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9942797) and next prime (9942883).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9942795 and 9942804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25366 + ... + 25754.

It is an arithmetic number, because the mean of its divisors is an integer number (342225).

Almost surely, 2^9942840 is an apocalyptic number.

9942840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9942840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16426800).

9942840 is an abundant number, since it is smaller than the sum of its proper divisors (22910760).

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

9942840 is a wasteful number, since it uses less digits than its factorization.

9942840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 9942840 is about 3153.2269185709. The cubic root of 9942840 is about 215.0321927637.

The spelling of 9942840 in words is "nine million, nine hundred forty-two thousand, eight hundred forty".