642195 has 32 divisors (see below), whose sum is σ = 1175040. Its totient is φ = 332640.

The previous prime is 642163. The next prime is 642197. The reversal of 642195 is 591246.

642195 is a `hidden beast` number, since 642 + 19 + 5 = 666.

642195 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 642195 - 2⁵ = 642163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642195.

It is not an unprimeable number, because it can be changed into a prime (642197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9010 + ... + 9080.

It is an arithmetic number, because the mean of its divisors is an integer number (36720).

2⁶⁴²¹⁹⁵ is an apocalyptic number.

642195 is a deficient number, since it is larger than the sum of its proper divisors (532845).

642195 is a wasteful number, since it uses less digits than its factorization.

642195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 146 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 642195 is about 801.3707007372. The cubic root of 642195 is about 86.2757956869.

The spelling of 642195 in words is "six hundred forty-two thousand, one hundred ninety-five".