1803121808 has 10 divisors (see below), whose sum is σ = 3493548534. Its totient is φ = 901560896.

The previous prime is 1803121799. The next prime is 1803121841. The reversal of 1803121808 is 8081213081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1748243344 + 54878464 = 41812^2 + 7408^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56347541 + ... + 56347572.

Almost surely, 2^1803121808 is an apocalyptic number.

It is an amenable number.

1803121808 is a deficient number, since it is larger than the sum of its proper divisors (1690426726).

1803121808 is a wasteful number, since it uses less digits than its factorization.

1803121808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112695121 (or 112695115 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1803121808 is about 42463.1817931723. The cubic root of 1803121808 is about 1217.1432324672.

Adding to 1803121808 its reverse (8081213081), we get a palindrome (9884334889).

The spelling of 1803121808 in words is "one billion, eight hundred three million, one hundred twenty-one thousand, eight hundred eight".