633643 has 4 divisors (see below), whose sum is σ = 636640. Its totient is φ = 630648.

The previous prime is 633629. The next prime is 633649. The reversal of 633643 is 346336.

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

It is a cyclic number.

It is not a de Polignac number, because 633643 - 2¹³ = 625451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (633649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155 + ... + 1612.

It is an arithmetic number, because the mean of its divisors is an integer number (159160).

2⁶³³⁶⁴³ is an apocalyptic number.

633643 is a deficient number, since it is larger than the sum of its proper divisors (2997).

633643 is a wasteful number, since it uses less digits than its factorization.

633643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996.

The product of its digits is 3888, while the sum is 25.

The square root of 633643 is about 796.0169596183. The cubic root of 633643 is about 85.8911097062.

Adding to 633643 its reverse (346336), we get a palindrome (979979).

The spelling of 633643 in words is "six hundred thirty-three thousand, six hundred forty-three".