642206 has 12 divisors (see below), whose sum is σ = 1008672. Its totient is φ = 306636.

The previous prime is 642199. The next prime is 642211. The reversal of 642206 is 602246.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 755 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (84056).

2⁶⁴²²⁰⁶ is an apocalyptic number.

642206 is a deficient number, since it is larger than the sum of its proper divisors (366466).

642206 is a wasteful number, since it uses less digits than its factorization.

642206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 642206 is about 801.3775639485. The cubic root of 642206 is about 86.2762882830.

It can be divided in two parts, 642 and 206, that added together give a palindrome (848).

The spelling of 642206 in words is "six hundred forty-two thousand, two hundred six".