642018 has 16 divisors (see below), whose sum is σ = 1382976. Its totient is φ = 197520.

The previous prime is 642013. The next prime is 642049. The reversal of 642018 is 810246.

It is a super-2 number, since 2×642018² = 824374224648, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641985 and 642003.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642018.

It is not an unprimeable number, because it can be changed into a prime (642011) by changing a digit.

642018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 4038 + ... + 4193.

It is an arithmetic number, because the mean of its divisors is an integer number (86436).

2⁶⁴²⁰¹⁸ is an apocalyptic number.

642018 is an abundant number, since it is smaller than the sum of its proper divisors (740958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642018 is a wasteful number, since it uses less digits than its factorization.

642018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8249.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 642018 is about 801.2602573446. The cubic root of 642018 is about 86.2678685936.

It can be divided in two parts, 6 and 42018, that added together give a palindrome (42024).

The spelling of 642018 in words is "six hundred forty-two thousand, eighteen".