1820814 has 8 divisors (see below), whose sum is σ = 3641640. Its totient is φ = 606936.

The previous prime is 1820813. The next prime is 1820821. The reversal of 1820814 is 4180281.

It is a sphenic number, since it is the product of 3 distinct primes.

1820814 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820813) 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 3 ways as a sum of consecutive naturals, for example, 151729 + ... + 151740.

It is an arithmetic number, because the mean of its divisors is an integer number (455205).

2^1820814 is an apocalyptic number.

1820814 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1820814 is a wasteful number, since it uses less digits than its factorization.

1820814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303474.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1820814 is about 1349.3754110699. The cubic root of 1820814 is about 122.1111143923. Note that the first 5 decimals are identical.

The spelling of 1820814 in words is "one million, eight hundred twenty thousand, eight hundred fourteen".