985520409 has 16 divisors (see below), whose sum is σ = 1319767680. Its totient is φ = 654151680.

The previous prime is 985520383. The next prime is 985520461. The reversal of 985520409 is 904025589.

It is not a de Polignac number, because 985520409 - 2⁷ = 985520281 is a prime.

It is a super-3 number, since 3×985520409³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (985520009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1281177 + ... + 1281945.

It is an arithmetic number, because the mean of its divisors is an integer number (82485480).

Almost surely, 2^985520409 is an apocalyptic number.

It is an amenable number.

985520409 is a deficient number, since it is larger than the sum of its proper divisors (334247271).

985520409 is a wasteful number, since it uses less digits than its factorization.

985520409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 985520409 is about 31392.9993629153. Note that the first 3 decimals coincide. The cubic root of 985520409 is about 995.1499850500.

The spelling of 985520409 in words is "nine hundred eighty-five million, five hundred twenty thousand, four hundred nine".