1008391 has 6 divisors (see below), whose sum is σ = 1028976. Its totient is φ = 988200.

The previous prime is 1008379. The next prime is 1008401. The reversal of 1008391 is 1938001.

It is not a de Polignac number, because 1008391 - 2⁷ = 1008263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1008331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3586 + ... + 3856.

It is an arithmetic number, because the mean of its divisors is an integer number (171496).

2^1008391 is an apocalyptic number.

1008391 is a deficient number, since it is larger than the sum of its proper divisors (20585).

1008391 is an frugal number, since it uses more digits than its factorization.

1008391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1008391 is about 1004.1867356224. The cubic root of 1008391 is about 100.2789213057.

The spelling of 1008391 in words is "one million, eight thousand, three hundred ninety-one".