642238 has 8 divisors (see below), whose sum is σ = 1014120. Its totient is φ = 304200.

The previous prime is 642233. The next prime is 642241. The reversal of 642238 is 832246.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642233) 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, 8413 + ... + 8488.

It is an arithmetic number, because the mean of its divisors is an integer number (126765).

2⁶⁴²²³⁸ is an apocalyptic number.

642238 is a deficient number, since it is larger than the sum of its proper divisors (371882).

642238 is a wasteful number, since it uses less digits than its factorization.

642238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16922.

The product of its digits is 2304, while the sum is 25.

The square root of 642238 is about 801.3975293199. The cubic root of 642238 is about 86.2777212580.

It can be divided in two parts, 6422 and 38, that multiplied together give a square (244036 = 494²).

The spelling of 642238 in words is "six hundred forty-two thousand, two hundred thirty-eight".