1985038209 has 48 divisors (see below), whose sum is σ = 3617961984. Its totient is φ = 1018735200.

The previous prime is 1985038199. The next prime is 1985038241. The reversal of 1985038209 is 9028305891.

It is a happy number.

It is not a de Polignac number, because 1985038209 - 2¹³ = 1985030017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985038249) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40264 + ... + 74774.

It is an arithmetic number, because the mean of its divisors is an integer number (75374208).

Almost surely, 2^1985038209 is an apocalyptic number.

It is an amenable number.

1985038209 is a deficient number, since it is larger than the sum of its proper divisors (1632923775).

1985038209 is a wasteful number, since it uses less digits than its factorization.

1985038209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34618 (or 34615 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1985038209 is about 44553.7676184630. The cubic root of 1985038209 is about 1256.7714034930.

The spelling of 1985038209 in words is "one billion, nine hundred eighty-five million, thirty-eight thousand, two hundred nine".