1809901086 has 64 divisors (see below), whose sum is σ = 4279074816. Its totient is φ = 499413600.

The previous prime is 1809901061. The next prime is 1809901127. The reversal of 1809901086 is 6801099081.

It is a super-2 number, since 2×1809901086² = 6551483882207958792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820461 + ... + 822663.

It is an arithmetic number, because the mean of its divisors is an integer number (66860544).

Almost surely, 2^1809901086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1809901086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2139537408).

1809901086 is an abundant number, since it is smaller than the sum of its proper divisors (2469173730).

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

1809901086 is a wasteful number, since it uses less digits than its factorization.

1809901086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 1809901086 is about 42542.9322684744. The cubic root of 1809901086 is about 1218.6667074491. Note that the first 3 decimals are identical.

The spelling of 1809901086 in words is "one billion, eight hundred nine million, nine hundred one thousand, eighty-six".