2018645 has 4 divisors (see below), whose sum is σ = 2422380. Its totient is φ = 1614912.

The previous prime is 2018633. The next prime is 2018647. The reversal of 2018645 is 5468102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 850084 + 1168561 = 922^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018645 - 2⁴ = 2018629 is a prime.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 201860 + ... + 201869.

It is an arithmetic number, because the mean of its divisors is an integer number (605595).

2^2018645 is an apocalyptic number.

It is an amenable number.

2018645 is a deficient number, since it is larger than the sum of its proper divisors (403735).

2018645 is an equidigital number, since it uses as much as digits as its factorization.

2018645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403734.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2018645 is about 1420.7902730523. The cubic root of 2018645 is about 126.3824150682.

The spelling of 2018645 in words is "two million, eighteen thousand, six hundred forty-five".