1985278853 has 12 divisors (see below), whose sum is σ = 2111908260. Its totient is φ = 1865859072.

The previous prime is 1985278849. The next prime is 1985278861. The reversal of 1985278853 is 3588725891.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 25180324 + 1960098529 = 5018^2 + 44273^2 .

It is not a de Polignac number, because 1985278853 - 2² = 1985278849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985278153) by changing a digit.

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, 217775 + ... + 226707.

It is an arithmetic number, because the mean of its divisors is an integer number (175992355).

Almost surely, 2^1985278853 is an apocalyptic number.

It is an amenable number.

1985278853 is a deficient number, since it is larger than the sum of its proper divisors (126629407).

1985278853 is an equidigital number, since it uses as much as digits as its factorization.

1985278853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9736 (or 9719 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 56.

The square root of 1985278853 is about 44556.4681387562. The cubic root of 1985278853 is about 1256.8221871128.

The spelling of 1985278853 in words is "one billion, nine hundred eighty-five million, two hundred seventy-eight thousand, eight hundred fifty-three".