9909381 has 4 divisors (see below), whose sum is σ = 13212512. Its totient is φ = 6606252.

The previous prime is 9909373. The next prime is 9909397. The reversal of 9909381 is 1839099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9909381 - 2³ = 9909373 is a prime.

It is a super-2 number, since 2×9909381² = 196391663606322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1651561 + ... + 1651566.

It is an arithmetic number, because the mean of its divisors is an integer number (3303128).

Almost surely, 2^9909381 is an apocalyptic number.

It is an amenable number.

9909381 is a deficient number, since it is larger than the sum of its proper divisors (3303131).

9909381 is a wasteful number, since it uses less digits than its factorization.

9909381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303130.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 9909381 is about 3147.9169302890. The cubic root of 9909381 is about 214.7907175679.

The spelling of 9909381 in words is "nine million, nine hundred nine thousand, three hundred eighty-one".