1986386945 has 4 divisors (see below), whose sum is σ = 2383664340. Its totient is φ = 1589109552.

The previous prime is 1986386933. The next prime is 1986386953. The reversal of 1986386945 is 5496836891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 343138576 + 1643248369 = 18524^2 + 40537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986386945 - 2²⁴ = 1969609729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198638690 + ... + 198638699.

It is an arithmetic number, because the mean of its divisors is an integer number (595916085).

Almost surely, 2^1986386945 is an apocalyptic number.

It is an amenable number.

1986386945 is a deficient number, since it is larger than the sum of its proper divisors (397277395).

1986386945 is an equidigital number, since it uses as much as digits as its factorization.

1986386945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397277394.

The product of its digits is 11197440, while the sum is 59.

The square root of 1986386945 is about 44568.9010970654. The cubic root of 1986386945 is about 1257.0559772057.

The spelling of 1986386945 in words is "one billion, nine hundred eighty-six million, three hundred eighty-six thousand, nine hundred forty-five".