642106 has 4 divisors (see below), whose sum is σ = 963162. Its totient is φ = 321052.

The previous prime is 642079. The next prime is 642113. The reversal of 642106 is 601246.

642106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601246 = 2 ⋅300623.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 93025 = 741^2 + 305^2 .

It is a super-3 number, since 3×642106³ = 794221133381181048, which contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160525 + ... + 160528.

2⁶⁴²¹⁰⁶ is an apocalyptic number.

642106 is a deficient number, since it is larger than the sum of its proper divisors (321056).

642106 is a wasteful number, since it uses less digits than its factorization.

642106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321055.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 642106 is about 801.3151689566. The cubic root of 642106 is about 86.2718099294.

The spelling of 642106 in words is "six hundred forty-two thousand, one hundred six".