643242 has 16 divisors (see below), whose sum is σ = 1314432. Its totient is φ = 209760.

The previous prime is 643231. The next prime is 643243. The reversal of 643242 is 242346.

It is not an unprimeable number, because it can be changed into a prime (643243) 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, 859 + ... + 1422.

It is an arithmetic number, because the mean of its divisors is an integer number (82152).

2⁶⁴³²⁴² is an apocalyptic number.

643242 is an abundant number, since it is smaller than the sum of its proper divisors (671190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643242 is a wasteful number, since it uses less digits than its factorization.

643242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333.

The product of its digits is 1152, while the sum is 21.

The square root of 643242 is about 802.0236904232. The cubic root of 643242 is about 86.3226566935.

Adding to 643242 its reverse (242346), we get a palindrome (885588).

The spelling of 643242 in words is "six hundred forty-three thousand, two hundred forty-two".