2018405 has 4 divisors (see below), whose sum is σ = 2422092. Its totient is φ = 1614720.

The previous prime is 2018383. The next prime is 2018407. The reversal of 2018405 is 5048102.

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 982081 + 1036324 = 991^2 + 1018^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2018405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201836 + ... + 201845.

It is an arithmetic number, because the mean of its divisors is an integer number (605523).

2^2018405 is an apocalyptic number.

It is an amenable number.

2018405 is a deficient number, since it is larger than the sum of its proper divisors (403687).

2018405 is an equidigital number, since it uses as much as digits as its factorization.

2018405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403686.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2018405 is about 1420.7058105041. The cubic root of 2018405 is about 126.3774062658.

The spelling of 2018405 in words is "two million, eighteen thousand, four hundred five".