1820472888 has 64 divisors (see below), whose sum is σ = 4910693760. Its totient is φ = 559069056.

The previous prime is 1820472887. The next prime is 1820472917. The reversal of 1820472888 is 8882740281.

It is a Cunningham number, because it is equal to 42667²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820472881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165331 + ... + 175997.

It is an arithmetic number, because the mean of its divisors is an integer number (76729590).

Almost surely, 2^1820472888 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 1820472888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455346880).

1820472888 is an abundant number, since it is smaller than the sum of its proper divisors (3090220872).

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

1820472888 is a wasteful number, since it uses less digits than its factorization.

1820472888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11236 (or 11232 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 48.

The square root of 1820472888 is about 42666.9999882813. Note that the first 4 decimals coincide. The cubic root of 1820472888 is about 1221.0348846819.

The spelling of 1820472888 in words is "one billion, eight hundred twenty million, four hundred seventy-two thousand, eight hundred eighty-eight".