1278845 has 8 divisors (see below), whose sum is σ = 1542240. Its totient is φ = 1018000.

The previous prime is 1278839. The next prime is 1278857. The reversal of 1278845 is 5488721.

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

It is not a de Polignac number, because 1278845 - 2¹⁴ = 1262461 is a prime.

It is a Curzon number.

It is a congruent number.

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, 746 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (192780).

2^1278845 is an apocalyptic number.

It is an amenable number.

1278845 is a deficient number, since it is larger than the sum of its proper divisors (263395).

1278845 is a wasteful number, since it uses less digits than its factorization.

1278845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275.

The product of its digits is 17920, while the sum is 35.

The square root of 1278845 is about 1130.8602919901. The cubic root of 1278845 is about 108.5440369991.

The spelling of 1278845 in words is "one million, two hundred seventy-eight thousand, eight hundred forty-five".