8421524 has 6 divisors (see below), whose sum is σ = 14737674. Its totient is φ = 4210760.

The previous prime is 8421509. The next prime is 8421529. The reversal of 8421524 is 4251248.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8305924 + 115600 = 2882^2 + 340^2 .

It is a d-powerful number, because it can be written as 8⁵ + 4 + 2 + 1 + 5³ + 2²³ + 4² .

It is a junction number, because it is equal to n+sod(n) for n = 8421493 and 8421502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052687 + ... + 1052694.

It is an arithmetic number, because the mean of its divisors is an integer number (2456279).

Almost surely, 2^8421524 is an apocalyptic number.

It is an amenable number.

8421524 is a deficient number, since it is larger than the sum of its proper divisors (6316150).

8421524 is a wasteful number, since it uses less digits than its factorization.

8421524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105385 (or 2105383 counting only the distinct ones).

The product of its digits is 2560, while the sum is 26.

The square root of 8421524 is about 2901.9862163697. The cubic root of 8421524 is about 203.4527495858.

The spelling of 8421524 in words is "eight million, four hundred twenty-one thousand, five hundred twenty-four".