642917 has 8 divisors (see below), whose sum is σ = 707232. Its totient is φ = 579600.

The previous prime is 642907. The next prime is 642931. The reversal of 642917 is 719246.

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 642917 - 2⁶ = 642853 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 642917.

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 642917.

It is not an unprimeable number, because it can be changed into a prime (642907) 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, 2183 + ... + 2459.

It is an arithmetic number, because the mean of its divisors is an integer number (88404).

2⁶⁴²⁹¹⁷ is an apocalyptic number.

It is an amenable number.

642917 is a deficient number, since it is larger than the sum of its proper divisors (64315).

642917 is a wasteful number, since it uses less digits than its factorization.

642917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its digits is 3024, while the sum is 29.

The square root of 642917 is about 801.8210523552. The cubic root of 642917 is about 86.3081159816.

It can be divided in two parts, 6429 and 17, that added together give a palindrome (6446).

The spelling of 642917 in words is "six hundred forty-two thousand, nine hundred seventeen".