642213 has 24 divisors (see below), whose sum is σ = 1092000. Its totient is φ = 358560.

The previous prime is 642211. The next prime is 642217. The reversal of 642213 is 312246.

It is a happy number.

642213 is a `hidden beast` number, since 642 + 21 + 3 = 666.

642213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642213 - 2¹ = 642211 is a prime.

It is a Curzon number.

642213 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1038 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (45500).

2⁶⁴²²¹³ is an apocalyptic number.

It is an amenable number.

642213 is a deficient number, since it is larger than the sum of its proper divisors (449787).

642213 is a wasteful number, since it uses less digits than its factorization.

642213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 526 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 642213 is about 801.3819314160. The cubic root of 642213 is about 86.2766017504.

Adding to 642213 its reverse (312246), we get a palindrome (954459).

The spelling of 642213 in words is "six hundred forty-two thousand, two hundred thirteen".