642210 has 16 divisors (see below), whose sum is σ = 1541376. Its totient is φ = 171248.

The previous prime is 642199. The next prime is 642211. The reversal of 642210 is 12246.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a nialpdrome in base 10 and base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 642210.

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 7 ways as a sum of consecutive naturals, for example, 10674 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (96336).

2⁶⁴²²¹⁰ is an apocalyptic number.

642210 is an abundant number, since it is smaller than the sum of its proper divisors (899166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642210 is a wasteful number, since it uses less digits than its factorization.

642210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21417.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 642210 is about 801.3800596471. The cubic root of 642210 is about 86.2764674075.

Adding to 642210 its reverse (12246), we get a palindrome (654456).

The spelling of 642210 in words is "six hundred forty-two thousand, two hundred ten".