1278667 has 8 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 1151040.

The previous prime is 1278659. The next prime is 1278671. The reversal of 1278667 is 7668721.

It is a happy number.

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 1278667 - 2³ = 1278659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667 + ... + 1732.

It is an arithmetic number, because the mean of its divisors is an integer number (176400).

2^1278667 is an apocalyptic number.

1278667 is a deficient number, since it is larger than the sum of its proper divisors (132533).

1278667 is a wasteful number, since it uses less digits than its factorization.

1278667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453.

The product of its digits is 28224, while the sum is 37.

The square root of 1278667 is about 1130.7815881062. The cubic root of 1278667 is about 108.5390007528.

The spelling of 1278667 in words is "one million, two hundred seventy-eight thousand, six hundred sixty-seven".