1808321136 has 40 divisors (see below), whose sum is σ = 4681557504. Its totient is φ = 601475520.

The previous prime is 1808321131. The next prime is 1808321167. The reversal of 1808321136 is 6311238081.

It is a junction number, because it is equal to n+sod(n) for n = 1808321097 and 1808321106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808321131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17920 + ... + 62751.

Almost surely, 2^1808321136 is an apocalyptic number.

1808321136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1808321136 is an abundant number, since it is smaller than the sum of its proper divisors (2873236368).

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

1808321136 is a wasteful number, since it uses less digits than its factorization.

1808321136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81149 (or 81143 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1808321136 is about 42524.3593249798. The cubic root of 1808321136 is about 1218.3119932202.

The spelling of 1808321136 in words is "one billion, eight hundred eight million, three hundred twenty-one thousand, one hundred thirty-six".