1811371872 has 48 divisors (see below), whose sum is σ = 4763776752. Its totient is φ = 602657280.

The previous prime is 1811371853. The next prime is 1811371873. The reversal of 1811371872 is 2781731181.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1811371872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811371873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34498 + ... + 69374.

It is an arithmetic number, because the mean of its divisors is an integer number (99245349).

Almost surely, 2^1811371872 is an apocalyptic number.

1811371872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1811371872 is an abundant number, since it is smaller than the sum of its proper divisors (2952404880).

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

1811371872 is a wasteful number, since it uses less digits than its factorization.

1811371872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35431 (or 35423 counting only the distinct ones).

The product of its digits is 18816, while the sum is 39.

The square root of 1811371872 is about 42560.2146611128. The cubic root of 1811371872 is about 1218.9967278102.

The spelling of 1811371872 in words is "one billion, eight hundred eleven million, three hundred seventy-one thousand, eight hundred seventy-two".