1820303388 has 48 divisors (see below), whose sum is σ = 4736178720. Its totient is φ = 604598400.

The previous prime is 1820303371. The next prime is 1820303411. The reversal of 1820303388 is 8833030281.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358 + ... + 60338.

It is an arithmetic number, because the mean of its divisors is an integer number (98670390).

Almost surely, 2^1820303388 is an apocalyptic number.

1820303388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820303388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2368089360).

1820303388 is an abundant number, since it is smaller than the sum of its proper divisors (2915875332).

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

1820303388 is a wasteful number, since it uses less digits than its factorization.

1820303388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60275 (or 60267 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1820303388 is about 42665.0136294365. The cubic root of 1820303388 is about 1220.9969875989.

The spelling of 1820303388 in words is "one billion, eight hundred twenty million, three hundred three thousand, three hundred eighty-eight".