1801171812 has 48 divisors (see below), whose sum is σ = 4587331392. Its totient is φ = 545508480.

The previous prime is 1801171781. The next prime is 1801171819. The reversal of 1801171812 is 2181711081.

It is a self number, because there is not a number n which added to its sum of digits gives 1801171812.

It is not an unprimeable number, because it can be changed into a prime (1801171819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398638 + ... + 403130.

It is an arithmetic number, because the mean of its divisors is an integer number (95569404).

Almost surely, 2^1801171812 is an apocalyptic number.

1801171812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1801171812 is an abundant number, since it is smaller than the sum of its proper divisors (2786159580).

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

1801171812 is a wasteful number, since it uses less digits than its factorization.

1801171812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7548 (or 7546 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 30.

The square root of 1801171812 is about 42440.2145611918. The cubic root of 1801171812 is about 1216.7043121231.

Adding to 1801171812 its reverse (2181711081), we get a palindrome (3982882893).

The spelling of 1801171812 in words is "one billion, eight hundred one million, one hundred seventy-one thousand, eight hundred twelve".