9661405 has 16 divisors (see below), whose sum is σ = 13144320. Its totient is φ = 6758208.

The previous prime is 9661397. The next prime is 9661409. The reversal of 9661405 is 5041669.

It is a cyclic number.

It is not a de Polignac number, because 9661405 - 2³ = 9661397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661409) 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, 2677 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (821520).

Almost surely, 2^9661405 is an apocalyptic number.

9661405 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9661405 is a deficient number, since it is larger than the sum of its proper divisors (3482915).

9661405 is a wasteful number, since it uses less digits than its factorization.

9661405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 9661405 is about 3108.2800710361. The cubic root of 9661405 is about 212.9838938059.

The spelling of 9661405 in words is "nine million, six hundred sixty-one thousand, four hundred five".