642839307 has 8 divisors (see below), whose sum is σ = 935039040. Its totient is φ = 389599560.

The previous prime is 642839291. The next prime is 642839321. The reversal of 642839307 is 703938246.

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

It is not a de Polignac number, because 642839307 - 2⁴ = 642839291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642839347) 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, 9739957 + ... + 9740022.

It is an arithmetic number, because the mean of its divisors is an integer number (116879880).

Almost surely, 2^642839307 is an apocalyptic number.

642839307 is a deficient number, since it is larger than the sum of its proper divisors (292199733).

642839307 is a wasteful number, since it uses less digits than its factorization.

642839307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19479993.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 642839307 is about 25354.2759115696. The cubic root of 642839307 is about 863.0463922047.

The spelling of 642839307 in words is "six hundred forty-two million, eight hundred thirty-nine thousand, three hundred seven".