8445840 has 80 divisors (see below), whose sum is σ = 28206528. Its totient is φ = 2078208.

The previous prime is 8445799. The next prime is 8445841. The reversal of 8445840 is 485448.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (8445841) 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, 1767 + ... + 4473.

Almost surely, 2^8445840 is an apocalyptic number.

8445840 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 8445840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14103264).

8445840 is an abundant number, since it is smaller than the sum of its proper divisors (19760688).

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

8445840 is a wasteful number, since it uses less digits than its factorization.

8445840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736 (or 2730 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 8445840 is about 2906.1727409086. The cubic root of 8445840 is about 203.6483754317.

The spelling of 8445840 in words is "eight million, four hundred forty-five thousand, eight hundred forty".