1278965 has 8 divisors (see below), whose sum is σ = 1542840. Its totient is φ = 1017792.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278965 is 5698721.

It can be written as a sum of positive squares in 4 ways, for example, as 108241 + 1170724 = 329^2 + 1082^2 .

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 1278965 - 2⁸ = 1278709 is a prime.

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

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, 587 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (192855).

2^1278965 is an apocalyptic number.

It is an amenable number.

1278965 is a deficient number, since it is larger than the sum of its proper divisors (263875).

1278965 is a wasteful number, since it uses less digits than its factorization.

1278965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351.

The product of its digits is 30240, while the sum is 38.

The square root of 1278965 is about 1130.9133476973. The cubic root of 1278965 is about 108.5474319575.

The spelling of 1278965 in words is "one million, two hundred seventy-eight thousand, nine hundred sixty-five".