1918859 has 2 divisors, whose sum is σ = 1918860. Its totient is φ = 1918858.

The previous prime is 1918849. The next prime is 1918879. The reversal of 1918859 is 9588191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1918859 - 2²⁰ = 870283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1918849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959429 + 959430.

It is an arithmetic number, because the mean of its divisors is an integer number (959430).

2^1918859 is an apocalyptic number.

1918859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918859 is an equidigital number, since it uses as much as digits as its factorization.

1918859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 41.

The square root of 1918859 is about 1385.2288619575. The cubic root of 1918859 is about 124.2646748575.

The spelling of 1918859 in words is "one million, nine hundred eighteen thousand, eight hundred fifty-nine".