1809448920 has 192 divisors, whose sum is σ = 6102570240. Its totient is φ = 464486400.

The previous prime is 1809448909. The next prime is 1809448933. The reversal of 1809448920 is 298449081.

1809448920 is a `hidden beast` number, since 1 + 80 + 94 + 489 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3135672 + ... + 3136248.

It is an arithmetic number, because the mean of its divisors is an integer number (31784220).

Almost surely, 2^1809448920 is an apocalyptic number.

1809448920 is a gapful number since it is divisible by the number (10) 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 1809448920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3051285120).

1809448920 is an abundant number, since it is smaller than the sum of its proper divisors (4293121320).

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

1809448920 is a wasteful number, since it uses less digits than its factorization.

1809448920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1809448920 is about 42537.6177048034. The cubic root of 1809448920 is about 1218.5652128518.

The spelling of 1809448920 in words is "one billion, eight hundred nine million, four hundred forty-eight thousand, nine hundred twenty".