1918871 has 4 divisors (see below), whose sum is σ = 1922544. Its totient is φ = 1915200.

The previous prime is 1918859. The next prime is 1918879. The reversal of 1918871 is 1788191.

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

It is a cyclic number.

It is not a de Polignac number, because 1918871 - 2¹⁰ = 1917847 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918879) 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, 890 + ... + 2151.

It is an arithmetic number, because the mean of its divisors is an integer number (480636).

2^1918871 is an apocalyptic number.

1918871 is a deficient number, since it is larger than the sum of its proper divisors (3673).

1918871 is an equidigital number, since it uses as much as digits as its factorization.

1918871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672.

The product of its digits is 4032, while the sum is 35.

The square root of 1918871 is about 1385.2331933649. The cubic root of 1918871 is about 124.2649338956.

The spelling of 1918871 in words is "one million, nine hundred eighteen thousand, eight hundred seventy-one".