9866623 has 4 divisors (see below), whose sum is σ = 10625608. Its totient is φ = 9107640.

The previous prime is 9866611. The next prime is 9866627. The reversal of 9866623 is 3266689.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9866623 - 2²¹ = 7769471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9866627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379473 + ... + 379498.

It is an arithmetic number, because the mean of its divisors is an integer number (2656402).

Almost surely, 2^9866623 is an apocalyptic number.

9866623 is a deficient number, since it is larger than the sum of its proper divisors (758985).

9866623 is a wasteful number, since it uses less digits than its factorization.

9866623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758984.

The product of its digits is 93312, while the sum is 40.

The square root of 9866623 is about 3141.1181130292. The cubic root of 9866623 is about 214.4813385851.

It can be divided in two parts, 98666 and 23, that added together give a palindrome (98689).

The spelling of 9866623 in words is "nine million, eight hundred sixty-six thousand, six hundred twenty-three".