642307 has 4 divisors (see below), whose sum is σ = 654480. Its totient is φ = 630136.

The previous prime is 642281. The next prime is 642359. The reversal of 642307 is 703246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642307 - 2¹¹ = 640259 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642407) 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, 6007 + ... + 6112.

It is an arithmetic number, because the mean of its divisors is an integer number (163620).

2⁶⁴²³⁰⁷ is an apocalyptic number.

642307 is a deficient number, since it is larger than the sum of its proper divisors (12173).

642307 is a wasteful number, since it uses less digits than its factorization.

642307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12172.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 642307 is about 801.4405779595. The cubic root of 642307 is about 86.2808109483.

It can be divided in two parts, 642 and 307, that added together give a palindrome (949).

The spelling of 642307 in words is "six hundred forty-two thousand, three hundred seven".