1278145 has 16 divisors (see below), whose sum is σ = 1772928. Its totient is φ = 874240.

The previous prime is 1278139. The next prime is 1278163. The reversal of 1278145 is 5418721.

1278145 = 353² + 354² + ... + 362².

It is not a de Polignac number, because 1278145 - 2⁵ = 1278113 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (110808).

2^1278145 is an apocalyptic number.

It is an amenable number.

1278145 is a deficient number, since it is larger than the sum of its proper divisors (494783).

1278145 is a wasteful number, since it uses less digits than its factorization.

1278145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its digits is 2240, while the sum is 28.

The square root of 1278145 is about 1130.5507507405. The cubic root of 1278145 is about 108.5242288406.

The spelling of 1278145 in words is "one million, two hundred seventy-eight thousand, one hundred forty-five".