9985405 has 4 divisors (see below), whose sum is σ = 11982492. Its totient is φ = 7988320.

The previous prime is 9985403. The next prime is 9985421. The reversal of 9985405 is 5045899.

9985405 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045899 = 71 ⋅71069.

It can be written as a sum of positive squares in 2 ways, for example, as 4481689 + 5503716 = 2117^2 + 2346^2 .

It is not a de Polignac number, because 9985405 - 2¹ = 9985403 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

9985405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998536 + ... + 998545.

It is an arithmetic number, because the mean of its divisors is an integer number (2995623).

Almost surely, 2^9985405 is an apocalyptic number.

It is an amenable number.

9985405 is a deficient number, since it is larger than the sum of its proper divisors (1997087).

9985405 is a wasteful number, since it uses less digits than its factorization.

9985405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997086.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 9985405 is about 3159.9691454190. The cubic root of 9985405 is about 215.3386047225.

The spelling of 9985405 in words is "nine million, nine hundred eighty-five thousand, four hundred five".