1985206444 has 24 divisors (see below), whose sum is σ = 3742572960. Its totient is φ = 915949824.

The previous prime is 1985206423. The next prime is 1985206451. The reversal of 1985206444 is 4446025891.

It is a self number, because there is not a number n which added to its sum of digits gives 1985206444.

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 7 ways as a sum of consecutive naturals, for example, 276897 + ... + 283975.

It is an arithmetic number, because the mean of its divisors is an integer number (155940540).

Almost surely, 2^1985206444 is an apocalyptic number.

It is an amenable number.

1985206444 is a deficient number, since it is larger than the sum of its proper divisors (1757366516).

1985206444 is a wasteful number, since it uses less digits than its factorization.

1985206444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12489 (or 12487 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 1985206444 is about 44555.6555781643. The cubic root of 1985206444 is about 1256.8069069178.

The spelling of 1985206444 in words is "one billion, nine hundred eighty-five million, two hundred six thousand, four hundred forty-four".