643237 has 8 divisors (see below), whose sum is σ = 752576. Its totient is φ = 538272.

The previous prime is 643231. The next prime is 643243. The reversal of 643237 is 732346.

It is an interprime number because it is at equal distance from previous prime (643231) and next prime (643243).

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

It is not a de Polignac number, because 643237 - 2¹⁵ = 610469 is a prime.

It is a d-powerful number, because it can be written as 6 + 4⁵ + 2¹⁹ + 3³ + 3⁵ + 7⁶ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643231) 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, 768 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (94072).

2⁶⁴³²³⁷ is an apocalyptic number.

It is an amenable number.

643237 is a deficient number, since it is larger than the sum of its proper divisors (109339).

643237 is a wasteful number, since it uses less digits than its factorization.

643237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187.

The product of its digits is 3024, while the sum is 25.

The square root of 643237 is about 802.0205733022. The cubic root of 643237 is about 86.3224330273.

The spelling of 643237 in words is "six hundred forty-three thousand, two hundred thirty-seven".