8421345 has 12 divisors (see below), whose sum is σ = 14597076. Its totient is φ = 4491360.

The previous prime is 8421251. The next prime is 8421403. The reversal of 8421345 is 5431248.

8421345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 7306209 = 1056^2 + 2703^2 .

It is not a de Polignac number, because 8421345 - 2⁹ = 8420833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93526 + ... + 93615.

It is an arithmetic number, because the mean of its divisors is an integer number (1216423).

Almost surely, 2^8421345 is an apocalyptic number.

It is an amenable number.

8421345 is a deficient number, since it is larger than the sum of its proper divisors (6175731).

8421345 is a wasteful number, since it uses less digits than its factorization.

8421345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187152 (or 187149 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 8421345 is about 2901.9553752599. The cubic root of 8421345 is about 203.4513081088.

It can be divided in two parts, 842 and 1345, that added together give a 7-th power (2187 = 3⁷).

The spelling of 8421345 in words is "eight million, four hundred twenty-one thousand, three hundred forty-five".