642167 has 4 divisors (see below), whose sum is σ = 643896. Its totient is φ = 640440.

The previous prime is 642163. The next prime is 642197. The reversal of 642167 is 761246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 761246 = 2 ⋅380623.

It is a cyclic number.

It is not a de Polignac number, because 642167 - 2² = 642163 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (160974).

2⁶⁴²¹⁶⁷ is an apocalyptic number.

642167 is a deficient number, since it is larger than the sum of its proper divisors (1729).

642167 is a wasteful number, since it uses less digits than its factorization.

642167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728.

The product of its digits is 2016, while the sum is 26.

The square root of 642167 is about 801.3532304795. The cubic root of 642167 is about 86.2745417804.

The spelling of 642167 in words is "six hundred forty-two thousand, one hundred sixty-seven".