1820828 has 12 divisors (see below), whose sum is σ = 3218712. Its totient is φ = 901200.

The previous prime is 1820821. The next prime is 1820837. The reversal of 1820828 is 8280281.

It is a self number, because there is not a number n which added to its sum of digits gives 1820828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820821) 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, 1850 + ... + 2657.

It is an arithmetic number, because the mean of its divisors is an integer number (268226).

2^1820828 is an apocalyptic number.

It is an amenable number.

1820828 is a deficient number, since it is larger than the sum of its proper divisors (1397884).

1820828 is a wasteful number, since it uses less digits than its factorization.

1820828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612 (or 4610 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 1820828 is about 1349.3805986452. The cubic root of 1820828 is about 122.1114273569. Note that the first 3 decimals are identical.

The spelling of 1820828 in words is "one million, eight hundred twenty thousand, eight hundred twenty-eight".