8521236 has 18 divisors (see below), whose sum is σ = 21539882. Its totient is φ = 2840400.

The previous prime is 8521231. The next prime is 8521237. The reversal of 8521236 is 6321258.

It can be written as a sum of positive squares in only one way, i.e., 6533136 + 1988100 = 2556^2 + 1410^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×8521236² = 145222925935392, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118315 + ... + 118386.

Almost surely, 2^8521236 is an apocalyptic number.

It is an amenable number.

8521236 is an abundant number, since it is smaller than the sum of its proper divisors (13018646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8521236 is a wasteful number, since it uses less digits than its factorization.

8521236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236711 (or 236706 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 8521236 is about 2919.1156194985. The cubic root of 8521236 is about 204.2525706717.

It can be divided in two parts, 85 and 21236, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 8521236 in words is "eight million, five hundred twenty-one thousand, two hundred thirty-six".