642219 has 12 divisors (see below), whose sum is σ = 905256. Its totient is φ = 404928.

The previous prime is 642217. The next prime is 642223. The reversal of 642219 is 912246.

It is not a de Polignac number, because 642219 - 2¹ = 642217 is a prime.

It is a super-2 number, since 2×642219² = 824890487922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642211) 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 11 ways as a sum of consecutive naturals, for example, 787 + ... + 1379.

It is an arithmetic number, because the mean of its divisors is an integer number (75438).

2⁶⁴²²¹⁹ is an apocalyptic number.

642219 is a deficient number, since it is larger than the sum of its proper divisors (263037).

642219 is a wasteful number, since it uses less digits than its factorization.

642219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 615 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 642219 is about 801.3856749406. The cubic root of 642219 is about 86.2768704349.

It can be divided in two parts, 6422 and 19, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 642219 in words is "six hundred forty-two thousand, two hundred nineteen".