8398720 has 64 divisors (see below), whose sum is σ = 21921840. Its totient is φ = 3051520.

The previous prime is 8398679. The next prime is 8398721. The reversal of 8398720 is 278938.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 8398720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8398721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6444 + ... + 7636.

Almost surely, 2^8398720 is an apocalyptic number.

8398720 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 8398720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10960920).

8398720 is an abundant number, since it is smaller than the sum of its proper divisors (13523120).

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

8398720 is a wasteful number, since it uses less digits than its factorization.

8398720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 8398720 is about 2898.0545198460. The cubic root of 8398720 is about 203.2689455421.

It can be divided in two parts, 839 and 8720, that added together give a palindrome (9559).

The spelling of 8398720 in words is "eight million, three hundred ninety-eight thousand, seven hundred twenty".