1801047636 has 120 divisors (see below), whose sum is σ = 4817329440. Its totient is φ = 586605888.

The previous prime is 1801047623. The next prime is 1801047649. The reversal of 1801047636 is 6367401081.

1801047636 is a `hidden beast` number, since 1 + 8 + 0 + 10 + 4 + 7 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (1801047623) and next prime (1801047649).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 1801047636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3538150 + ... + 3538658.

It is an arithmetic number, because the mean of its divisors is an integer number (40144412).

Almost surely, 2^1801047636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801047636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2408664720).

1801047636 is an abundant number, since it is smaller than the sum of its proper divisors (3016281804).

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

1801047636 is a wasteful number, since it uses less digits than its factorization.

1801047636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1801047636 is about 42438.7515839003. The cubic root of 1801047636 is about 1216.6763508914.

The spelling of 1801047636 in words is "one billion, eight hundred one million, forty-seven thousand, six hundred thirty-six".