1986800641 has 4 divisors (see below), whose sum is σ = 2270629312. Its totient is φ = 1702971972.

The previous prime is 1986800623. The next prime is 1986800723. The reversal of 1986800641 is 1460086891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986800641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1986800611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141914325 + ... + 141914338.

It is an arithmetic number, because the mean of its divisors is an integer number (567657328).

Almost surely, 2^1986800641 is an apocalyptic number.

It is an amenable number.

1986800641 is a deficient number, since it is larger than the sum of its proper divisors (283828671).

1986800641 is an equidigital number, since it uses as much as digits as its factorization.

1986800641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283828670.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1986800641 is about 44573.5419391369. The cubic root of 1986800641 is about 1257.1432383060.

The spelling of 1986800641 in words is "one billion, nine hundred eighty-six million, eight hundred thousand, six hundred forty-one".