1278455 has 8 divisors (see below), whose sum is σ = 1600992. Its totient is φ = 978208.

The previous prime is 1278439. The next prime is 1278463. The reversal of 1278455 is 5548721.

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

It is a cyclic number.

It is not a de Polignac number, because 1278455 - 2⁴ = 1278439 is a prime.

It is a Duffinian 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, 5444 + ... + 5673.

It is an arithmetic number, because the mean of its divisors is an integer number (200124).

2^1278455 is an apocalyptic number.

1278455 is a deficient number, since it is larger than the sum of its proper divisors (322537).

1278455 is a wasteful number, since it uses less digits than its factorization.

1278455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11145.

The product of its digits is 11200, while the sum is 32.

The square root of 1278455 is about 1130.6878437482. The cubic root of 1278455 is about 108.5330019170.

The spelling of 1278455 in words is "one million, two hundred seventy-eight thousand, four hundred fifty-five".