2018421389 has 4 divisors (see below), whose sum is σ = 2022838524. Its totient is φ = 2014004256.

The previous prime is 2018421371. The next prime is 2018421409. The reversal of 2018421389 is 9831248102.

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 989102500 + 1029318889 = 31450^2 + 32083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018421389 - 2⁸ = 2018421133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018421589) 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, 2207882 + ... + 2208795.

It is an arithmetic number, because the mean of its divisors is an integer number (505709631).

Almost surely, 2^2018421389 is an apocalyptic number.

It is an amenable number.

2018421389 is a deficient number, since it is larger than the sum of its proper divisors (4417135).

2018421389 is an equidigital number, since it uses as much as digits as its factorization.

2018421389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4417134.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 2018421389 is about 44926.8448591708. The cubic root of 2018421389 is about 1263.7774831705. Note that the first 3 decimals are identical.

The spelling of 2018421389 in words is "two billion, eighteen million, four hundred twenty-one thousand, three hundred eighty-nine".