1278553 has 4 divisors (see below), whose sum is σ = 1353780. Its totient is φ = 1203328.

The previous prime is 1278551. The next prime is 1278583. The reversal of 1278553 is 3558721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3558721 = 23 ⋅154727.

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 169744 = 1053^2 + 412^2 .

It is not a de Polignac number, because 1278553 - 2¹ = 1278551 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37588 + ... + 37621.

It is an arithmetic number, because the mean of its divisors is an integer number (338445).

2^1278553 is an apocalyptic number.

It is an amenable number.

1278553 is a deficient number, since it is larger than the sum of its proper divisors (75227).

1278553 is an equidigital number, since it uses as much as digits as its factorization.

1278553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75226.

The product of its digits is 8400, while the sum is 31.

The square root of 1278553 is about 1130.7311793702. The cubic root of 1278553 is about 108.5357750462.

The spelling of 1278553 in words is "one million, two hundred seventy-eight thousand, five hundred fifty-three".