9966731 has 4 divisors (see below), whose sum is σ = 10209864. Its totient is φ = 9723600.

The previous prime is 9966721. The next prime is 9966769. The reversal of 9966731 is 1376699.

It is a happy number.

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 9966731 - 2⁶ = 9966667 is a prime.

It is a super-2 number, since 2×9966731² = 198671453652722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 243091 = 9966731 / (9 + 9 + 6 + 6 + 7 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9966701) 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, 121505 + ... + 121586.

It is an arithmetic number, because the mean of its divisors is an integer number (2552466).

Almost surely, 2^9966731 is an apocalyptic number.

9966731 is a deficient number, since it is larger than the sum of its proper divisors (243133).

9966731 is a wasteful number, since it uses less digits than its factorization.

9966731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243132.

The product of its digits is 61236, while the sum is 41.

The square root of 9966731 is about 3157.0129869863. The cubic root of 9966731 is about 215.2042839328.

It can be divided in two parts, 996 and 6731, that multiplied together give a palindrome (6704076).

The spelling of 9966731 in words is "nine million, nine hundred sixty-six thousand, seven hundred thirty-one".