1278129 has 8 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 842336.

The previous prime is 1278113. The next prime is 1278131. The reversal of 1278129 is 9218721.

1278129 is nontrivially palindromic in base 4.

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 1278129 - 2⁴ = 1278113 is a prime.

It is a super-4 number, since 4×1278129⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1278096 and 1278105.

It is not an unprimeable number, because it can be changed into a prime (1278139) 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, 2127 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

2^1278129 is an apocalyptic number.

It is an amenable number.

1278129 is a deficient number, since it is larger than the sum of its proper divisors (445551).

1278129 is an equidigital number, since it uses as much as digits as its factorization.

1278129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879.

The product of its digits is 2016, while the sum is 30.

The square root of 1278129 is about 1130.5436745212. The cubic root of 1278129 is about 108.5237759981.

It can be divided in two parts, 127 and 8129, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 1278129 in words is "one million, two hundred seventy-eight thousand, one hundred twenty-nine".