1281393 has 8 divisors (see below), whose sum is σ = 1898400. Its totient is φ = 854244.

The previous prime is 1281389. The next prime is 1281407. The reversal of 1281393 is 3931821.

It is not a de Polignac number, because 1281393 - 2² = 1281389 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: 47459 = 1281393 / (1 + 2 + 8 + 1 + 3 + 9 + 3).

It is not an unprimeable number, because it can be changed into a prime (1281383) 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, 23703 + ... + 23756.

It is an arithmetic number, because the mean of its divisors is an integer number (237300).

2^1281393 is an apocalyptic number.

It is an amenable number.

1281393 is a deficient number, since it is larger than the sum of its proper divisors (617007).

1281393 is an equidigital number, since it uses as much as digits as its factorization.

1281393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47468 (or 47462 counting only the distinct ones).

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

The square root of 1281393 is about 1131.9863073377. The cubic root of 1281393 is about 108.6160777149.

It can be divided in two parts, 128 and 1393, that added together give a square (1521 = 39²).

The spelling of 1281393 in words is "one million, two hundred eighty-one thousand, three hundred ninety-three".