1809472320 has 84 divisors (see below), whose sum is σ = 6223840740. Its totient is φ = 482525184.

The previous prime is 1809472289. The next prime is 1809472321. The reversal of 1809472320 is 232749081.

1809472320 is a `hidden beast` number, since 180 + 9 + 472 + 3 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1025024256 + 784448064 = 32016^2 + 28008^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809472321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311265 + ... + 317024.

Almost surely, 2^1809472320 is an apocalyptic number.

1809472320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809472320 is an abundant number, since it is smaller than the sum of its proper divisors (4414368420).

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

1809472320 is a wasteful number, since it uses less digits than its factorization.

1809472320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628312 (or 628299 counting only the distinct ones).

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

The square root of 1809472320 is about 42537.8927545782. The cubic root of 1809472320 is about 1218.5704657040.

The spelling of 1809472320 in words is "one billion, eight hundred nine million, four hundred seventy-two thousand, three hundred twenty".