642237 has 8 divisors (see below), whose sum is σ = 865536. Its totient is φ = 423552.

The previous prime is 642233. The next prime is 642241. The reversal of 642237 is 732246.

It is an interprime number because it is at equal distance from previous prime (642233) and next prime (642241).

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

It is not a de Polignac number, because 642237 - 2² = 642233 is a prime.

642237 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642237.

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 7 ways as a sum of consecutive naturals, for example, 813 + ... + 1394.

It is an arithmetic number, because the mean of its divisors is an integer number (108192).

2⁶⁴²²³⁷ is an apocalyptic number.

It is an amenable number.

642237 is a deficient number, since it is larger than the sum of its proper divisors (223299).

642237 is a wasteful number, since it uses less digits than its factorization.

642237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its digits is 2016, while the sum is 24.

The square root of 642237 is about 801.3969054095. The cubic root of 642237 is about 86.2776764783.

Subtracting 642237 from its reverse (732246), we obtain a palindrome (90009).

The spelling of 642237 in words is "six hundred forty-two thousand, two hundred thirty-seven".