1881805816 has 32 divisors (see below), whose sum is σ = 3850887600. Its totient is φ = 854979840.

The previous prime is 1881805799. The next prime is 1881805817. The reversal of 1881805816 is 6185081881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881805817) 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, 298990 + ... + 305218.

Almost surely, 2^1881805816 is an apocalyptic number.

It is an amenable number.

1881805816 is an abundant number, since it is smaller than the sum of its proper divisors (1969081784).

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

1881805816 is a wasteful number, since it uses less digits than its factorization.

1881805816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9679 (or 9675 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 46.

The square root of 1881805816 is about 43379.7857993790. The cubic root of 1881805816 is about 1234.5961988003.

The spelling of 1881805816 in words is "one billion, eight hundred eighty-one million, eight hundred five thousand, eight hundred sixteen".