2018643 has 24 divisors (see below), whose sum is σ = 3038784. Its totient is φ = 1190640.

The previous prime is 2018633. The next prime is 2018647. The reversal of 2018643 is 3468102.

It is a happy number.

It is not a de Polignac number, because 2018643 - 2¹³ = 2010451 is a prime.

It is a super-2 number, since 2×2018643² = 8149839122898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2018647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24280 + ... + 24362.

It is an arithmetic number, because the mean of its divisors is an integer number (126616).

2^2018643 is an apocalyptic number.

2018643 is a deficient number, since it is larger than the sum of its proper divisors (1020141).

2018643 is a wasteful number, since it uses less digits than its factorization.

2018643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2018643 is about 1420.7895692185. The cubic root of 2018643 is about 126.3823733298.

The spelling of 2018643 in words is "two million, eighteen thousand, six hundred forty-three".