1985839415 has 24 divisors (see below), whose sum is σ = 2786648832. Its totient is φ = 1354557120.

The previous prime is 1985839403. The next prime is 1985839423. The reversal of 1985839415 is 5149385891.

It is a happy number.

It is not a de Polignac number, because 1985839415 - 2²⁰ = 1984790839 is a prime.

It is a Duffinian number.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 25577 + ... + 68013.

It is an arithmetic number, because the mean of its divisors is an integer number (116110368).

Almost surely, 2^1985839415 is an apocalyptic number.

1985839415 is a deficient number, since it is larger than the sum of its proper divisors (800809417).

1985839415 is a wasteful number, since it uses less digits than its factorization.

1985839415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42647 (or 42640 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The square root of 1985839415 is about 44562.7581619450. The cubic root of 1985839415 is about 1256.9404678031.

The spelling of 1985839415 in words is "one billion, nine hundred eighty-five million, eight hundred thirty-nine thousand, four hundred fifteen".