1283391 has 8 divisors (see below), whose sum is σ = 1901360. Its totient is φ = 855576.

The previous prime is 1283389. The next prime is 1283417. The reversal of 1283391 is 1933821.

It is not a de Polignac number, because 1283391 - 2¹ = 1283389 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: 47533 = 1283391 / (1 + 2 + 8 + 3 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23740 + ... + 23793.

It is an arithmetic number, because the mean of its divisors is an integer number (237670).

2^1283391 is an apocalyptic number.

1283391 is a deficient number, since it is larger than the sum of its proper divisors (617969).

1283391 is an equidigital number, since it uses as much as digits as its factorization.

1283391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47542 (or 47536 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1283391 is about 1132.8684830994. The cubic root of 1283391 is about 108.6725012654.

The spelling of 1283391 in words is "one million, two hundred eighty-three thousand, three hundred ninety-one".