8909381 has 4 divisors (see below), whose sum is σ = 9594732. Its totient is φ = 8224032.

The previous prime is 8909359. The next prime is 8909387. The reversal of 8909381 is 1839098.

8909381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2102500 + 6806881 = 1450^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 8909381 - 2⁶ = 8909317 is a prime.

It is a super-2 number, since 2×8909381² = 158754139606322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8909387) 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, 342656 + ... + 342681.

It is an arithmetic number, because the mean of its divisors is an integer number (2398683).

Almost surely, 2^8909381 is an apocalyptic number.

It is an amenable number.

8909381 is a deficient number, since it is larger than the sum of its proper divisors (685351).

8909381 is a wasteful number, since it uses less digits than its factorization.

8909381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685350.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 8909381 is about 2984.8586231177. The cubic root of 8909381 is about 207.3078959452.

The spelling of 8909381 in words is "eight million, nine hundred nine thousand, three hundred eighty-one".