1805620 has 12 divisors (see below), whose sum is σ = 3791844. Its totient is φ = 722240.

The previous prime is 1805603. The next prime is 1805633. The reversal of 1805620 is 265081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 992016 = 902^2 + 996^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1805591 and 1805600.

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, 45121 + ... + 45160.

It is an arithmetic number, because the mean of its divisors is an integer number (315987).

2^1805620 is an apocalyptic number.

1805620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1805620 is an abundant number, since it is smaller than the sum of its proper divisors (1986224).

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

1805620 is a wasteful number, since it uses less digits than its factorization.

1805620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90290 (or 90288 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1805620 is about 1343.7336045511. The cubic root of 1805620 is about 121.7705082901.

The spelling of 1805620 in words is "one million, eight hundred five thousand, six hundred twenty".