642002186 has 16 divisors (see below), whose sum is σ = 1118618880. Its totient is φ = 270632880.

The previous prime is 642002183. The next prime is 642002227. The reversal of 642002186 is 681200246.

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, 375026 + ... + 376733.

It is an arithmetic number, because the mean of its divisors is an integer number (69913680).

Almost surely, 2^642002186 is an apocalyptic number.

642002186 is a deficient number, since it is larger than the sum of its proper divisors (476616694).

642002186 is a wasteful number, since it uses less digits than its factorization.

642002186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751829.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 642002186 is about 25337.7620558723. The cubic root of 642002186 is about 862.6716027947.

The spelling of 642002186 in words is "six hundred forty-two million, two thousand, one hundred eighty-six".