9855405 has 32 divisors (see below), whose sum is σ = 20025600. Its totient is φ = 4504896.

The previous prime is 9855401. The next prime is 9855413. The reversal of 9855405 is 5045589.

It is a happy number.

9855405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9855405 - 2² = 9855401 is a prime.

It is a Curzon number.

9855405 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9855405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9855401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4270 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (625800).

Almost surely, 2^9855405 is an apocalyptic number.

It is an amenable number.

9855405 is an abundant number, since it is smaller than the sum of its proper divisors (10170195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9855405 is a wasteful number, since it uses less digits than its factorization.

9855405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450 (or 10444 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 9855405 is about 3139.3319353009. The cubic root of 9855405 is about 214.4000218706.

The spelling of 9855405 in words is "nine million, eight hundred fifty-five thousand, four hundred five".