642306243 has 8 divisors (see below), whose sum is σ = 856569168. Its totient is φ = 428123744.

The previous prime is 642306233. The next prime is 642306253. The reversal of 642306243 is 342603246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642306233) and next prime (642306253).

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 642306243 - 2⁸ = 642305987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642306243.

It is not an unprimeable number, because it can be changed into a prime (642306233) 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, 2005 + ... + 35897.

It is an arithmetic number, because the mean of its divisors is an integer number (107071146).

Almost surely, 2^642306243 is an apocalyptic number.

642306243 is a deficient number, since it is larger than the sum of its proper divisors (214262925).

642306243 is a wasteful number, since it uses less digits than its factorization.

642306243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40213.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 642306243 is about 25343.7614216990. The cubic root of 642306243 is about 862.8077705248.

Adding to 642306243 its reverse (342603246), we get a palindrome (984909489).

The spelling of 642306243 in words is "six hundred forty-two million, three hundred six thousand, two hundred forty-three".