1808836816 has 20 divisors (see below), whose sum is σ = 3505396672. Its totient is φ = 904218336.

The previous prime is 1808836793. The next prime is 1808836823. The reversal of 1808836816 is 6186388081.

It is a self number, because there is not a number n which added to its sum of digits gives 1808836816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85225 + ... + 104311.

Almost surely, 2^1808836816 is an apocalyptic number.

1808836816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1808836816 is a deficient number, since it is larger than the sum of its proper divisors (1696559856).

1808836816 is a wasteful number, since it uses less digits than its factorization.

1808836816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25018 (or 25012 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 1808836816 is about 42530.4222410265. The cubic root of 1808836816 is about 1218.4277911290.

The spelling of 1808836816 in words is "one billion, eight hundred eight million, eight hundred thirty-six thousand, eight hundred sixteen".