8391906 has 24 divisors (see below), whose sum is σ = 18330624. Its totient is φ = 2774520.

The previous prime is 8391893. The next prime is 8391919. The reversal of 8391906 is 6091938.

It is an interprime number because it is at equal distance from previous prime (8391893) and next prime (8391919).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 451 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (763776).

Almost surely, 2^8391906 is an apocalyptic number.

8391906 is an abundant number, since it is smaller than the sum of its proper divisors (9938718).

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

8391906 is a wasteful number, since it uses less digits than its factorization.

8391906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 8391906 is about 2896.8786650462. The cubic root of 8391906 is about 203.2139590148.

Subtracting from 8391906 its reverse (6091938), we obtain a cube (2299968 = 132³).

The spelling of 8391906 in words is "eight million, three hundred ninety-one thousand, nine hundred six".