1804885920 has 216 divisors, whose sum is σ = 6544298124. Its totient is φ = 452886528.

The previous prime is 1804885909. The next prime is 1804885921. The reversal of 1804885920 is 295884081.

It is a happy number.

1804885920 is a `hidden beast` number, since 1 + 80 + 488 + 5 + 92 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 697593744 + 1107292176 = 26412^2 + 33276^2 .

It is a super-2 number, since 2×1804885920² = 6515226368428492800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1804885921) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 413992 + ... + 418328.

Almost surely, 2^1804885920 is an apocalyptic number.

1804885920 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 1804885920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3272149062).

1804885920 is an abundant number, since it is smaller than the sum of its proper divisors (4739412204).

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

1804885920 is a wasteful number, since it uses less digits than its factorization.

1804885920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392 (or 4364 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1804885920 is about 42483.9489689930. The cubic root of 1804885920 is about 1217.5400400320.

The spelling of 1804885920 in words is "one billion, eight hundred four million, eight hundred eighty-five thousand, nine hundred twenty".