1820428 has 24 divisors (see below), whose sum is σ = 3553200. Its totient is φ = 811008.

The previous prime is 1820419. The next prime is 1820431. The reversal of 1820428 is 8240281.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 588 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (148050).

2^1820428 is an apocalyptic number.

It is an amenable number.

1820428 is a deficient number, since it is larger than the sum of its proper divisors (1732772).

1820428 is a wasteful number, since it uses less digits than its factorization.

1820428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1820428 is about 1349.2323743522. The cubic root of 1820428 is about 122.1024848780.

The spelling of 1820428 in words is "one million, eight hundred twenty thousand, four hundred twenty-eight".