8381406 has 48 divisors (see below), whose sum is σ = 19064448. Its totient is φ = 2436000.

The previous prime is 8381393. The next prime is 8381437. The reversal of 8381406 is 6041838.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55431 + ... + 55581.

It is an arithmetic number, because the mean of its divisors is an integer number (397176).

Almost surely, 2^8381406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8381406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9532224).

8381406 is an abundant number, since it is smaller than the sum of its proper divisors (10683042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8381406 is a wasteful number, since it uses less digits than its factorization.

8381406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 196 counting only the distinct ones).

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

The square root of 8381406 is about 2895.0658023610. The cubic root of 8381406 is about 203.1291694923.

The spelling of 8381406 in words is "eight million, three hundred eighty-one thousand, four hundred six".