1986891050 has 24 divisors (see below), whose sum is σ = 3716280000. Its totient is φ = 790312880.

The previous prime is 1986891013. The next prime is 1986891073. The reversal of 1986891050 is 501986891.

It is a junction number, because it is equal to n+sod(n) for n = 1986890986 and 1986891004.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 102050 + ... + 119949.

It is an arithmetic number, because the mean of its divisors is an integer number (154845000).

Almost surely, 2^1986891050 is an apocalyptic number.

1986891050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1986891050 is a deficient number, since it is larger than the sum of its proper divisors (1729388950).

1986891050 is a wasteful number, since it uses less digits than its factorization.

1986891050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222190 (or 222185 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 1986891050 is about 44574.5560830391. The cubic root of 1986891050 is about 1257.1623067079.

The spelling of 1986891050 in words is "one billion, nine hundred eighty-six million, eight hundred ninety-one thousand, fifty".