633421 has 4 divisors (see below), whose sum is σ = 642172. Its totient is φ = 624672.

The previous prime is 633407. The next prime is 633427. The reversal of 633421 is 124336.

633421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 373321 = 510^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 633421 - 2¹⁹ = 109133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266 + ... + 4411.

It is an arithmetic number, because the mean of its divisors is an integer number (160543).

2⁶³³⁴²¹ is an apocalyptic number.

633421 is the 460-th hex number.

It is an amenable number.

633421 is a deficient number, since it is larger than the sum of its proper divisors (8751).

633421 is an equidigital number, since it uses as much as digits as its factorization.

633421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750.

The product of its digits is 432, while the sum is 19.

The square root of 633421 is about 795.8775031373. The cubic root of 633421 is about 85.8810777409.

Adding to 633421 its reverse (124336), we get a palindrome (757757).

The spelling of 633421 in words is "six hundred thirty-three thousand, four hundred twenty-one".