1800644356 has 45 divisors (see below), whose sum is σ = 3684606261. Its totient is φ = 769922496.

The previous prime is 1800644341. The next prime is 1800644371. The reversal of 1800644356 is 6534460081.

It is a happy number.

The square root of 1800644356 is 42434.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1800644341) and next prime (1800644371).

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 1598720256 = 14210^2 + 39984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4158316 + ... + 4158748.

Almost surely, 2^1800644356 is an apocalyptic number.

1800644356 is the 42434-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1800644356

1800644356 is an abundant number, since it is smaller than the sum of its proper divisors (1883961905).

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

1800644356 is an frugal number, since it uses more digits than its factorization.

1800644356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The cubic root of 1800644356 is about 1216.5855337737.

The spelling of 1800644356 in words is "one billion, eight hundred million, six hundred forty-four thousand, three hundred fifty-six".