8947840 has 128 divisors (see below), whose sum is σ = 24675840. Its totient is φ = 3072000.

The previous prime is 8947837. The next prime is 8947843. The reversal of 8947840 is 487498.

It is an interprime number because it is at equal distance from previous prime (8947837) and next prime (8947843).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 8947793 and 8947802.

It is not an unprimeable number, because it can be changed into a prime (8947843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218220 + ... + 218260.

It is an arithmetic number, because the mean of its divisors is an integer number (192780).

Almost surely, 2^8947840 is an apocalyptic number.

8947840 is a gapful number since it is divisible by the number (80) 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 8947840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12337920).

8947840 is an abundant number, since it is smaller than the sum of its proper divisors (15728000).

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

8947840 is a wasteful number, since it uses less digits than its factorization.

8947840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 8947840 is about 2991.2940343604. The cubic root of 8947840 is about 207.6057621194.

The spelling of 8947840 in words is "eight million, nine hundred forty-seven thousand, eight hundred forty".