1278103 has 4 divisors (see below), whose sum is σ = 1280448. Its totient is φ = 1275760.

The previous prime is 1278097. The next prime is 1278107. The reversal of 1278103 is 3018721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3018721 = 53 ⋅56957.

It is a cyclic number.

It is not a de Polignac number, because 1278103 - 2¹³ = 1269911 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1278103 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278107) 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, 123 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (320112).

2^1278103 is an apocalyptic number.

1278103 is a deficient number, since it is larger than the sum of its proper divisors (2345).

1278103 is an equidigital number, since it uses as much as digits as its factorization.

1278103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1278103 is about 1130.5321755704. The cubic root of 1278103 is about 108.5230401211.

The spelling of 1278103 in words is "one million, two hundred seventy-eight thousand, one hundred three".