8421545 has 16 divisors (see below), whose sum is σ = 11674368. Its totient is φ = 5763840.

The previous prime is 8421529. The next prime is 8421547. The reversal of 8421545 is 5451248.

It is not a de Polignac number, because 8421545 - 2⁴ = 8421529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8421547) 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, 3569 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (729648).

Almost surely, 2^8421545 is an apocalyptic number.

8421545 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8421545 is a deficient number, since it is larger than the sum of its proper divisors (3252823).

8421545 is a wasteful number, since it uses less digits than its factorization.

8421545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9040.

The product of its digits is 6400, while the sum is 29.

The square root of 8421545 is about 2901.9898345790. The cubic root of 8421545 is about 203.4529186963.

The spelling of 8421545 in words is "eight million, four hundred twenty-one thousand, five hundred forty-five".