2018421 has 12 divisors (see below), whose sum is σ = 2938572. Its totient is φ = 1334976.

The previous prime is 2018413. The next prime is 2018437. The reversal of 2018421 is 1248102.

It can be written as a sum of positive squares in 2 ways, for example, as 505521 + 1512900 = 711^2 + 1230^2 .

It is not a de Polignac number, because 2018421 - 2³ = 2018413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2018394 and 2018403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018021) 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 11 ways as a sum of consecutive naturals, for example, 415 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (244881).

2^2018421 is an apocalyptic number.

It is an amenable number.

2018421 is a deficient number, since it is larger than the sum of its proper divisors (920151).

2018421 is a wasteful number, since it uses less digits than its factorization.

2018421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2018421 is about 1420.7114414968. The cubic root of 2018421 is about 126.3777401983.

The spelling of 2018421 in words is "two million, eighteen thousand, four hundred twenty-one".