9861605 has 8 divisors (see below), whose sum is σ = 12744312. Its totient is φ = 7282368.

The previous prime is 9861583. The next prime is 9861611. The reversal of 9861605 is 5061689.

It can be written as a sum of positive squares in 4 ways, for example, as 214369 + 9647236 = 463^2 + 3106^2 .

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 9861605 - 2⁸ = 9861349 is a prime.

It is a super-3 number, since 3×9861605³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75794 + ... + 75923.

It is an arithmetic number, because the mean of its divisors is an integer number (1593039).

Almost surely, 2^9861605 is an apocalyptic number.

It is an amenable number.

9861605 is a deficient number, since it is larger than the sum of its proper divisors (2882707).

9861605 is a wasteful number, since it uses less digits than its factorization.

9861605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151735.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 9861605 is about 3140.3192512864. The cubic root of 9861605 is about 214.4449718747. Note that the first 3 decimals are identical.

The spelling of 9861605 in words is "nine million, eight hundred sixty-one thousand, six hundred five".