9405661 has 8 divisors (see below), whose sum is σ = 9672320. Its totient is φ = 9142848.

The previous prime is 9405653. The next prime is 9405667. The reversal of 9405661 is 1665049.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9405661 - 2³ = 9405653 is a prime.

It is an Ulam number.

It is a Duffinian number.

9405661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9405667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4405 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (1209040).

Almost surely, 2^9405661 is an apocalyptic number.

It is an amenable number.

9405661 is a deficient number, since it is larger than the sum of its proper divisors (266659).

9405661 is a wasteful number, since it uses less digits than its factorization.

9405661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

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

The square root of 9405661 is about 3066.8650117017. The cubic root of 9405661 is about 211.0877871944.

The spelling of 9405661 in words is "nine million, four hundred five thousand, six hundred sixty-one".