1800918 has 24 divisors (see below), whose sum is σ = 4459728. Its totient is φ = 514512.

The previous prime is 1800913. The next prime is 1800937. The reversal of 1800918 is 8190081.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1800891 and 1800900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800913) 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, 7021 + ... + 7272.

It is an arithmetic number, because the mean of its divisors is an integer number (185822).

2^1800918 is an apocalyptic number.

1800918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1800918 is an abundant number, since it is smaller than the sum of its proper divisors (2658810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1800918 is a wasteful number, since it uses less digits than its factorization.

1800918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14308 (or 14305 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1800918 is about 1341.9828612915. The cubic root of 1800918 is about 121.6647158837.

Adding to 1800918 its reverse (8190081), we get a palindrome (9990999).

The spelling of 1800918 in words is "one million, eight hundred thousand, nine hundred eighteen".