1985197599 has 64 divisors (see below), whose sum is σ = 3708288000. Its totient is φ = 1019589120.

The previous prime is 1985197567. The next prime is 1985197607. The reversal of 1985197599 is 9957915891.

It is not a de Polignac number, because 1985197599 - 2⁵ = 1985197567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985197099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 179667 + ... + 190395.

It is an arithmetic number, because the mean of its divisors is an integer number (57942000).

Almost surely, 2^1985197599 is an apocalyptic number.

1985197599 is a deficient number, since it is larger than the sum of its proper divisors (1723090401).

1985197599 is a wasteful number, since it uses less digits than its factorization.

1985197599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10845 (or 10839 counting only the distinct ones).

The product of its digits is 9185400, while the sum is 63.

The square root of 1985197599 is about 44555.5563201718. The cubic root of 1985197599 is about 1256.8050403657.

The spelling of 1985197599 in words is "one billion, nine hundred eighty-five million, one hundred ninety-seven thousand, five hundred ninety-nine".