635421 has 8 divisors (see below), whose sum is σ = 884160. Its totient is φ = 405152.

The previous prime is 635413. The next prime is 635423. The reversal of 635421 is 124536.

It is a happy number.

635421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 635421 - 2³ = 635413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536 + ... + 4673.

It is an arithmetic number, because the mean of its divisors is an integer number (110520).

2⁶³⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

635421 is a deficient number, since it is larger than the sum of its proper divisors (248739).

635421 is a wasteful number, since it uses less digits than its factorization.

635421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235.

The product of its digits is 720, while the sum is 21.

The square root of 635421 is about 797.1329876501. The cubic root of 635421 is about 85.9713713975.

Adding to 635421 its reverse (124536), we get a palindrome (759957).

The spelling of 635421 in words is "six hundred thirty-five thousand, four hundred twenty-one".