642229 has 8 divisors (see below), whose sum is σ = 766080. Its totient is φ = 526416.

The previous prime is 642223. The next prime is 642233. The reversal of 642229 is 922246.

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 642229 - 2⁵ = 642197 is a prime.

642229 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642223) 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 7 ways as a sum of consecutive naturals, for example, 1834 + ... + 2155.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2⁶⁴²²²⁹ is an apocalyptic number.

It is an amenable number.

642229 is a deficient number, since it is larger than the sum of its proper divisors (123851).

642229 is a wasteful number, since it uses less digits than its factorization.

642229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019.

The product of its digits is 1728, while the sum is 25.

The square root of 642229 is about 801.3919141094. The cubic root of 642229 is about 86.2773182386.

The spelling of 642229 in words is "six hundred forty-two thousand, two hundred twenty-nine".