8979840 has 96 divisors (see below), whose sum is σ = 31028400. Its totient is φ = 2393088.

The previous prime is 8979827. The next prime is 8979847. The reversal of 8979840 is 489798.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8979847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4981 + ... + 6539.

Almost surely, 2^8979840 is an apocalyptic number.

8979840 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 8979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15514200).

8979840 is an abundant number, since it is smaller than the sum of its proper divisors (22048560).

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

8979840 is a wasteful number, since it uses less digits than its factorization.

8979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 8979840 is about 2996.6381162897. The cubic root of 8979840 is about 207.8529532682.

The spelling of 8979840 in words is "eight million, nine hundred seventy-nine thousand, eight hundred forty".