236421 has 12 divisors (see below), whose sum is σ = 346060. Its totient is φ = 155520.
The previous prime is 236407. The next prime is 236429. The reversal of 236421 is 124632.
It is a happy number.
236421 is a `hidden beast` number, since 23 + 642 + 1 = 666.
It can be written as a sum of positive squares in 2 ways, for example, as 171396 + 65025 = 414^2 + 255^2 .
It is not a de Polignac number, because 236421 - 27 = 236293 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 236394 and 236403.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 236421.
It is not an unprimeable number, because it can be changed into a prime (236429) 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, 861 + ... + 1101.
2236421 is an apocalyptic number.
It is an amenable number.
236421 is a deficient number, since it is larger than the sum of its proper divisors (109639).
236421 is a wasteful number, since it uses less digits than its factorization.
236421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 356 (or 353 counting only the distinct ones).
The product of its digits is 288, while the sum is 18.
The square root of 236421 is about 486.2314263805. The cubic root of 236421 is about 61.8341910278.
The spelling of 236421 in words is "two hundred thirty-six thousand, four hundred twenty-one".
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