1918089 has 12 divisors (see below), whose sum is σ = 2866500. Its totient is φ = 1234464.

The previous prime is 1918087. The next prime is 1918097. The reversal of 1918089 is 9808191.

It can be written as a sum of positive squares in 2 ways, for example, as 1166400 + 751689 = 1080^2 + 867^2 .

It is not a de Polignac number, because 1918089 - 2¹ = 1918087 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1918087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3414 + ... + 3935.

It is an arithmetic number, because the mean of its divisors is an integer number (238875).

2^1918089 is an apocalyptic number.

It is an amenable number.

1918089 is a deficient number, since it is larger than the sum of its proper divisors (948411).

1918089 is a wasteful number, since it uses less digits than its factorization.

1918089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7384 (or 7381 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1918089 is about 1384.9509016568. The cubic root of 1918089 is about 124.2480509851.

The spelling of 1918089 in words is "one million, nine hundred eighteen thousand, eighty-nine".