8406381 has 8 divisors (see below), whose sum is σ = 11867904. Its totient is φ = 5274560.

The previous prime is 8406367. The next prime is 8406439. The reversal of 8406381 is 1836048.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8406381 - 2⁷ = 8406253 is a prime.

It is a super-2 number, since 2×8406381² = 141334483034322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8406481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82365 + ... + 82466.

It is an arithmetic number, because the mean of its divisors is an integer number (1483488).

Almost surely, 2^8406381 is an apocalyptic number.

It is an amenable number.

8406381 is a deficient number, since it is larger than the sum of its proper divisors (3461523).

8406381 is a wasteful number, since it uses less digits than its factorization.

8406381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164851.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 8406381 is about 2899.3759673419. The cubic root of 8406381 is about 203.3307315502.

The spelling of 8406381 in words is "eight million, four hundred six thousand, three hundred eighty-one".