8745021 has 24 divisors (see below), whose sum is σ = 13608504. Its totient is φ = 5391360.

The previous prime is 8745019. The next prime is 8745031. The reversal of 8745021 is 1205478.

8745021 is digitally balanced in base 3, 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 4 ways, for example, as 12996 + 8732025 = 114^2 + 2955^2 .

It is not a de Polignac number, because 8745021 - 2¹ = 8745019 is a prime.

8745021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8745031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8865 + ... + 9801.

It is an arithmetic number, because the mean of its divisors is an integer number (567021).

Almost surely, 2^8745021 is an apocalyptic number.

It is an amenable number.

8745021 is a deficient number, since it is larger than the sum of its proper divisors (4863483).

8745021 is a wasteful number, since it uses less digits than its factorization.

8745021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 8745021 is about 2957.1981671846. The cubic root of 8745021 is about 206.0251720897.

It can be divided in two parts, 874502 and 1, that added together give a triangular number (874503 = T₁₃₂₂).

The spelling of 8745021 in words is "eight million, seven hundred forty-five thousand, twenty-one".