1278123 has 24 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 662640.

The previous prime is 1278113. The next prime is 1278131. The reversal of 1278123 is 3218721.

It is not a de Polignac number, because 1278123 - 2⁴ = 1278107 is a prime.

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

1278123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1278093 and 1278102.

It is not an unprimeable number, because it can be changed into a prime (1278113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2290 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (89376).

2^1278123 is an apocalyptic number.

1278123 is a deficient number, since it is larger than the sum of its proper divisors (866901).

1278123 is a wasteful number, since it uses less digits than its factorization.

1278123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 524 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 1278123 is about 1130.5410209276. The cubic root of 1278123 is about 108.5236061812.

The spelling of 1278123 in words is "one million, two hundred seventy-eight thousand, one hundred twenty-three".