1820718 has 20 divisors (see below), whose sum is σ = 4080120. Its totient is φ = 606852.

The previous prime is 1820711. The next prime is 1820737. The reversal of 1820718 is 8170281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1820691 and 1820700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5458 + ... + 5781.

It is an arithmetic number, because the mean of its divisors is an integer number (204006).

2^1820718 is an apocalyptic number.

1820718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1820718 is an abundant number, since it is smaller than the sum of its proper divisors (2259402).

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

1820718 is a wasteful number, since it uses less digits than its factorization.

1820718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11253 (or 11244 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1820718 is about 1349.3398385877. The cubic root of 1820718 is about 122.1089683058.

Adding to 1820718 its reverse (8170281), we get a palindrome (9990999).

It can be divided in two parts, 18207 and 18, that added together give a square (18225 = 135²).

The spelling of 1820718 in words is "one million, eight hundred twenty thousand, seven hundred eighteen".