1278379 has 2 divisors, whose sum is σ = 1278380. Its totient is φ = 1278378.

The previous prime is 1278373. The next prime is 1278391. The reversal of 1278379 is 9738721.

It is a weak prime.

It is an emirp because it is prime and its reverse (9738721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278379 - 2³ = 1278371 is a prime.

1278379 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1278371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639189 + 639190.

It is an arithmetic number, because the mean of its divisors is an integer number (639190).

2^1278379 is an apocalyptic number.

1278379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278379 is an equidigital number, since it uses as much as digits as its factorization.

1278379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 1278379 is about 1130.6542353876. The cubic root of 1278379 is about 108.5308512295.

The spelling of 1278379 in words is "one million, two hundred seventy-eight thousand, three hundred seventy-nine".