642417 has 8 divisors (see below), whose sum is σ = 861696. Its totient is φ = 425712.

The previous prime is 642407. The next prime is 642419. The reversal of 642417 is 714246.

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

It is not a de Polignac number, because 642417 - 2¹¹ = 640369 is a prime.

642417 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (642419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (107712).

2⁶⁴²⁴¹⁷ is an apocalyptic number.

It is an amenable number.

642417 is a deficient number, since it is larger than the sum of its proper divisors (219279).

642417 is a wasteful number, since it uses less digits than its factorization.

642417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287.

The product of its digits is 1344, while the sum is 24.

The square root of 642417 is about 801.5092014444. The cubic root of 642417 is about 86.2857360840.

It can be divided in two parts, 6424 and 17, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 642417 in words is "six hundred forty-two thousand, four hundred seventeen".