1986816850 has 36 divisors (see below), whose sum is σ = 3734480286. Its totient is φ = 786365440.

The previous prime is 1986816847. The next prime is 1986816851. The reversal of 1986816850 is 586186891.

It can be written as a sum of positive squares in 9 ways, for example, as 3272481 + 1983544369 = 1809^2 + 44537^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986816851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3350154 + ... + 3350746.

Almost surely, 2^1986816850 is an apocalyptic number.

1986816850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1986816850 is a deficient number, since it is larger than the sum of its proper divisors (1747663436).

1986816850 is an equidigital number, since it uses as much as digits as its factorization.

1986816850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 1986816850 is about 44573.7237618757. The cubic root of 1986816850 is about 1257.1466570318.

The spelling of 1986816850 in words is "one billion, nine hundred eighty-six million, eight hundred sixteen thousand, eight hundred fifty".