1278923 has 4 divisors (see below), whose sum is σ = 1297008. Its totient is φ = 1260840.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278923 is 3298721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3298721 = 29 ⋅113749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278923 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278923.

It is not an unprimeable number, because it can be changed into a prime (1278983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8936 + ... + 9077.

It is an arithmetic number, because the mean of its divisors is an integer number (324252).

2^1278923 is an apocalyptic number.

1278923 is a deficient number, since it is larger than the sum of its proper divisors (18085).

1278923 is an equidigital number, since it uses as much as digits as its factorization.

1278923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18084.

The product of its digits is 6048, while the sum is 32.

The square root of 1278923 is about 1130.8947784829. The cubic root of 1278923 is about 108.5462437462.

The spelling of 1278923 in words is "one million, two hundred seventy-eight thousand, nine hundred twenty-three".