1813801808 has 160 divisors (see below), whose sum is σ = 4623704064. Its totient is φ = 668860416.

The previous prime is 1813801799. The next prime is 1813801819. The reversal of 1813801808 is 8081083181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3143216 + ... + 3143792.

Almost surely, 2^1813801808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1813801808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2311852032).

1813801808 is an abundant number, since it is smaller than the sum of its proper divisors (2809902256).

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

1813801808 is a wasteful number, since it uses less digits than its factorization.

1813801808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 38.

The square root of 1813801808 is about 42588.7521301106. The cubic root of 1813801808 is about 1219.5415746066.

Adding to 1813801808 its reverse (8081083181), we get a palindrome (9894884989).

The spelling of 1813801808 in words is "one billion, eight hundred thirteen million, eight hundred one thousand, eight hundred eight".