9861669 has 12 divisors (see below), whose sum is σ = 14772576. Its totient is φ = 6574284.

The previous prime is 9861667. The next prime is 9861679. The reversal of 9861669 is 9661689.

9861669 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 9861669 - 2¹ = 9861667 is a prime.

It is a super-2 number, since 2×9861669² = 194505030931122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20049 + ... + 20534.

It is an arithmetic number, because the mean of its divisors is an integer number (1231048).

Almost surely, 2^9861669 is an apocalyptic number.

It is an amenable number.

9861669 is a deficient number, since it is larger than the sum of its proper divisors (4910907).

9861669 is an equidigital number, since it uses as much as digits as its factorization.

9861669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40598 (or 40586 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 9861669 is about 3140.3294413166. The cubic root of 9861669 is about 214.4454357764.

The spelling of 9861669 in words is "nine million, eight hundred sixty-one thousand, six hundred sixty-nine".