1985065849 has 8 divisors (see below), whose sum is σ = 2138131520. Its totient is φ = 1832052816.

The previous prime is 1985065847. The next prime is 1985065903. The reversal of 1985065849 is 9485605891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1985065849 - 2¹ = 1985065847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1985065849.

It is not an unprimeable number, because it can be changed into a prime (1985065847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103582 + ... + 121240.

It is an arithmetic number, because the mean of its divisors is an integer number (267266440).

Almost surely, 2^1985065849 is an apocalyptic number.

It is an amenable number.

1985065849 is a deficient number, since it is larger than the sum of its proper divisors (153065671).

1985065849 is a wasteful number, since it uses less digits than its factorization.

1985065849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26319.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The square root of 1985065849 is about 44554.0778043941. The cubic root of 1985065849 is about 1256.7772366302. Note that the first 3 decimals are identical.

The spelling of 1985065849 in words is "one billion, nine hundred eighty-five million, sixty-five thousand, eight hundred forty-nine".