2018391 has 8 divisors (see below), whose sum is σ = 2707440. Its totient is φ = 1337472.

The previous prime is 2018383. The next prime is 2018407. The reversal of 2018391 is 1938102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2018391 - 2³ = 2018383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018381) 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 7 ways as a sum of consecutive naturals, for example, 1426 + ... + 2463.

It is an arithmetic number, because the mean of its divisors is an integer number (338430).

2^2018391 is an apocalyptic number.

2018391 is a deficient number, since it is larger than the sum of its proper divisors (689049).

2018391 is a wasteful number, since it uses less digits than its factorization.

2018391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 2018391 is about 1420.7008833671. The cubic root of 2018391 is about 126.3771140734.

The spelling of 2018391 in words is "two million, eighteen thousand, three hundred ninety-one".