8420529 has 16 divisors (see below), whose sum is σ = 12265344. Its totient is φ = 5107200.

The previous prime is 8420521. The next prime is 8420543. The reversal of 8420529 is 9250248.

It is not a de Polignac number, because 8420529 - 2³ = 8420521 is a prime.

It is a super-4 number, since 4×8420529⁴ (a number of 29 digits) contains 4444 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8420496 and 8420505.

It is not an unprimeable number, because it can be changed into a prime (8420521) 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, 1249 + ... + 4289.

It is an arithmetic number, because the mean of its divisors is an integer number (766584).

Almost surely, 2^8420529 is an apocalyptic number.

It is an amenable number.

8420529 is a deficient number, since it is larger than the sum of its proper divisors (3844815).

8420529 is a wasteful number, since it uses less digits than its factorization.

8420529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 8420529 is about 2901.8147769973. The cubic root of 8420529 is about 203.4447366474. Note that the first 3 decimals are identical.

The spelling of 8420529 in words is "eight million, four hundred twenty thousand, five hundred twenty-nine".