1278609 has 8 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 829296.

The previous prime is 1278601. The next prime is 1278611. The reversal of 1278609 is 9068721.

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

It is not a de Polignac number, because 1278609 - 2³ = 1278601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278601) 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, 5649 + ... + 5870.

It is an arithmetic number, because the mean of its divisors is an integer number (218880).

2^1278609 is an apocalyptic number.

It is an amenable number.

1278609 is a deficient number, since it is larger than the sum of its proper divisors (472431).

1278609 is a wasteful number, since it uses less digits than its factorization.

1278609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11559.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1278609 is about 1130.7559418371. The cubic root of 1278609 is about 108.5373596278.

The spelling of 1278609 in words is "one million, two hundred seventy-eight thousand, six hundred nine".