8345840 has 20 divisors (see below), whose sum is σ = 19404264. Its totient is φ = 3338304.

The previous prime is 8345839. The next prime is 8345891. The reversal of 8345840 is 485438.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8345797 and 8345806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52082 + ... + 52241.

Almost surely, 2^8345840 is an apocalyptic number.

8345840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8345840 is an abundant number, since it is smaller than the sum of its proper divisors (11058424).

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

8345840 is a wasteful number, since it uses less digits than its factorization.

8345840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104336 (or 104330 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 8345840 is about 2888.9167520024. The cubic root of 8345840 is about 202.8414399196.

The spelling of 8345840 in words is "eight million, three hundred forty-five thousand, eight hundred forty".