8421072 has 80 divisors (see below), whose sum is σ = 24373440. Its totient is φ = 2483200.

The previous prime is 8421071. The next prime is 8421079. The reversal of 8421072 is 2701248.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21454 + ... + 21842.

It is an arithmetic number, because the mean of its divisors is an integer number (304668).

Almost surely, 2^8421072 is an apocalyptic number.

8421072 is a gapful number since it is divisible by the number (82) 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 8421072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12186720).

8421072 is an abundant number, since it is smaller than the sum of its proper divisors (15952368).

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

8421072 is a wasteful number, since it uses less digits than its factorization.

8421072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 8421072 is about 2901.9083376289. The cubic root of 8421072 is about 203.4491096156.

The spelling of 8421072 in words is "eight million, four hundred twenty-one thousand, seventy-two".