8438720 has 28 divisors (see below), whose sum is σ = 20095464. Its totient is φ = 3375360.

The previous prime is 8438699. The next prime is 8438741. The reversal of 8438720 is 278348.

It is an interprime number because it is at equal distance from previous prime (8438699) and next prime (8438741).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a d-powerful number, because it can be written as 8³ + 4² + 3² + 8⁵ + 7⁵ + 2²³ + 0 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12866 + ... + 13505.

Almost surely, 2^8438720 is an apocalyptic number.

8438720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8438720 is an abundant number, since it is smaller than the sum of its proper divisors (11656744).

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

8438720 is a wasteful number, since it uses less digits than its factorization.

8438720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26388 (or 26378 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 8438720 is about 2904.9475038286. The cubic root of 8438720 is about 203.5911328888.

The spelling of 8438720 in words is "eight million, four hundred thirty-eight thousand, seven hundred twenty".