1278359 has 4 divisors (see below), whose sum is σ = 1283016. Its totient is φ = 1273704.

The previous prime is 1278341. The next prime is 1278371. The reversal of 1278359 is 9538721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278379) 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, 1889 + ... + 2474.

It is an arithmetic number, because the mean of its divisors is an integer number (320754).

2^1278359 is an apocalyptic number.

1278359 is a deficient number, since it is larger than the sum of its proper divisors (4657).

1278359 is an equidigital number, since it uses as much as digits as its factorization.

1278359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656.

The product of its digits is 15120, while the sum is 35.

The square root of 1278359 is about 1130.6453909162. The cubic root of 1278359 is about 108.5302852450.

The spelling of 1278359 in words is "one million, two hundred seventy-eight thousand, three hundred fifty-nine".