1148391 has 8 divisors (see below), whose sum is σ = 1701360. Its totient is φ = 765576.

The previous prime is 1148387. The next prime is 1148437. The reversal of 1148391 is 1938411.

It is not a de Polignac number, because 1148391 - 2² = 1148387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 42533 = 1148391 / (1 + 1 + 4 + 8 + 3 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1148311) 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 7 ways as a sum of consecutive naturals, for example, 21240 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (212670).

2^1148391 is an apocalyptic number.

1148391 is a deficient number, since it is larger than the sum of its proper divisors (552969).

1148391 is an equidigital number, since it uses as much as digits as its factorization.

1148391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42542 (or 42536 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1148391 is about 1071.6300667674. The cubic root of 1148391 is about 104.7200707001.

The spelling of 1148391 in words is "one million, one hundred forty-eight thousand, three hundred ninety-one".