1899856818 has 24 divisors (see below), whose sum is σ = 4123768428. Its totient is φ = 632145312.

The previous prime is 1899856813. The next prime is 1899856867. The reversal of 1899856818 is 8186589981.

It can be written as a sum of positive squares in 2 ways, for example, as 1789543809 + 110313009 = 42303^2 + 10503^2 .

It is not an unprimeable number, because it can be changed into a prime (1899856813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84721 + ... + 104772.

Almost surely, 2^1899856818 is an apocalyptic number.

1899856818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1899856818 is an abundant number, since it is smaller than the sum of its proper divisors (2223911610).

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

1899856818 is a wasteful number, since it uses less digits than its factorization.

1899856818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190058 (or 190055 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 63.

The square root of 1899856818 is about 43587.3469942826. The cubic root of 1899856818 is about 1238.5312165975.

The spelling of 1899856818 in words is "one billion, eight hundred ninety-nine million, eight hundred fifty-six thousand, eight hundred eighteen".