8409381 has 32 divisors (see below), whose sum is σ = 12503040. Its totient is φ = 5007744.

The previous prime is 8409377. The next prime is 8409383. The reversal of 8409381 is 1839048.

It is not a de Polignac number, because 8409381 - 2² = 8409377 is a prime.

It is a super-2 number, since 2×8409381² = 141435377606322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8409383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115161 + ... + 115233.

It is an arithmetic number, because the mean of its divisors is an integer number (390720).

Almost surely, 2^8409381 is an apocalyptic number.

It is an amenable number.

8409381 is a deficient number, since it is larger than the sum of its proper divisors (4093659).

8409381 is a wasteful number, since it uses less digits than its factorization.

8409381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 8409381 is about 2899.8932738982. The cubic root of 8409381 is about 203.3549163390.

The spelling of 8409381 in words is "eight million, four hundred nine thousand, three hundred eighty-one".