1805428 has 12 divisors (see below), whose sum is σ = 3178980. Its totient is φ = 897152.

The previous prime is 1805413. The next prime is 1805473. The reversal of 1805428 is 8245081.

It can be written as a sum of positive squares in 2 ways, for example, as 1304164 + 501264 = 1142^2 + 708^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1805396 and 1805405.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 613 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (264915).

2^1805428 is an apocalyptic number.

It is an amenable number.

1805428 is a deficient number, since it is larger than the sum of its proper divisors (1373552).

1805428 is a wasteful number, since it uses less digits than its factorization.

1805428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1805428 is about 1343.6621599197. The cubic root of 1805428 is about 121.7661919949.

The spelling of 1805428 in words is "one million, eight hundred five thousand, four hundred twenty-eight".