642002185 has 8 divisors (see below), whose sum is σ = 840439296. Its totient is φ = 466910640.

The previous prime is 642002183. The next prime is 642002227. The reversal of 642002185 is 581200246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642002185 - 2¹ = 642002183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642002183) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5836329 + ... + 5836438.

It is an arithmetic number, because the mean of its divisors is an integer number (105054912).

Almost surely, 2^642002185 is an apocalyptic number.

It is an amenable number.

642002185 is a deficient number, since it is larger than the sum of its proper divisors (198437111).

642002185 is a wasteful number, since it uses less digits than its factorization.

642002185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672783.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 642002185 is about 25337.7620361389. The cubic root of 642002185 is about 862.6716023468.

The spelling of 642002185 in words is "six hundred forty-two million, two thousand, one hundred eighty-five".