436221 has 12 divisors (see below), whose sum is σ = 663520. Its totient is φ = 275400.

The previous prime is 436217. The next prime is 436231. The reversal of 436221 is 122634.

It is a happy number.

436221 is a `hidden beast` number, since 43 + 622 + 1 = 666.

It is not a de Polignac number, because 436221 - 2² = 436217 is a prime.

It is a Duffinian number.

436221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 436194 and 436203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (436231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1105 + ... + 1446.

2⁴³⁶²²¹ is an apocalyptic number.

It is an amenable number.

436221 is a deficient number, since it is larger than the sum of its proper divisors (227299).

436221 is a wasteful number, since it uses less digits than its factorization.

436221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576 (or 2573 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 436221 is about 660.4702869925. The cubic root of 436221 is about 75.8406749993.

Adding to 436221 its reverse (122634), we get a palindrome (558855).

The spelling of 436221 in words is "four hundred thirty-six thousand, two hundred twenty-one".