1887616985 has 4 divisors (see below), whose sum is σ = 2265140388. Its totient is φ = 1510093584.

The previous prime is 1887616957. The next prime is 1887617003. The reversal of 1887616985 is 5896167881.

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 1288738201 + 598878784 = 35899^2 + 24472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1887616985 - 2⁸ = 1887616729 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 188761694 + ... + 188761703.

It is an arithmetic number, because the mean of its divisors is an integer number (566285097).

Almost surely, 2^1887616985 is an apocalyptic number.

It is an amenable number.

1887616985 is a deficient number, since it is larger than the sum of its proper divisors (377523403).

1887616985 is an equidigital number, since it uses as much as digits as its factorization.

1887616985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377523402.

The product of its digits is 5806080, while the sum is 59.

The square root of 1887616985 is about 43446.7143176558. The cubic root of 1887616985 is about 1235.8657372846.

The spelling of 1887616985 in words is "one billion, eight hundred eighty-seven million, six hundred sixteen thousand, nine hundred eighty-five".