1278385 has 8 divisors (see below), whose sum is σ = 1544256. Its totient is φ = 1015920.

The previous prime is 1278379. The next prime is 1278391. The reversal of 1278385 is 5838721.

It is an interprime number because it is at equal distance from previous prime (1278379) and next prime (1278391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1278385 - 2¹³ = 1270193 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278385.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (193032).

2^1278385 is an apocalyptic number.

It is an amenable number.

1278385 is a deficient number, since it is larger than the sum of its proper divisors (265871).

1278385 is a wasteful number, since it uses less digits than its factorization.

1278385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703.

The product of its digits is 13440, while the sum is 34.

The square root of 1278385 is about 1130.6568887156. The cubic root of 1278385 is about 108.5310210237.

The spelling of 1278385 in words is "one million, two hundred seventy-eight thousand, three hundred eighty-five".