1918845 has 12 divisors (see below), whose sum is σ = 3326076. Its totient is φ = 1023360.

The previous prime is 1918837. The next prime is 1918849. The reversal of 1918845 is 5488191.

It can be written as a sum of positive squares in 2 ways, for example, as 962361 + 956484 = 981^2 + 978^2 .

It is not a de Polignac number, because 1918845 - 2³ = 1918837 is a prime.

It is a super-2 number, since 2×1918845² = 7363932268050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918849) 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, 21276 + ... + 21365.

It is an arithmetic number, because the mean of its divisors is an integer number (277173).

2^1918845 is an apocalyptic number.

1918845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918845 is a deficient number, since it is larger than the sum of its proper divisors (1407231).

1918845 is a wasteful number, since it uses less digits than its factorization.

1918845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42652 (or 42649 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1918845 is about 1385.2238086317. The cubic root of 1918845 is about 124.2643726449.

The spelling of 1918845 in words is "one million, nine hundred eighteen thousand, eight hundred forty-five".