1918105 has 12 divisors (see below), whose sum is σ = 2677860. Its totient is φ = 1315104.

The previous prime is 1918097. The next prime is 1918121. The reversal of 1918105 is 5018191.

It can be written as a sum of positive squares in 2 ways, for example, as 451584 + 1466521 = 672^2 + 1211^2 .

It is not a de Polignac number, because 1918105 - 2³ = 1918097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1918105.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3670 + ... + 4159.

It is an arithmetic number, because the mean of its divisors is an integer number (223155).

2^1918105 is an apocalyptic number.

It is an amenable number.

1918105 is a deficient number, since it is larger than the sum of its proper divisors (759755).

1918105 is an equidigital number, since it uses as much as digits as its factorization.

1918105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848 (or 7841 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 1918105 is about 1384.9566780228. The cubic root of 1918105 is about 124.2483964615.

The spelling of 1918105 in words is "one million, nine hundred eighteen thousand, one hundred five".