1272129 has 8 divisors (see below), whose sum is σ = 1721760. Its totient is φ = 835296.

The previous prime is 1272113. The next prime is 1272133. The reversal of 1272129 is 9212721.

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

It is not a de Polignac number, because 1272129 - 2⁴ = 1272113 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1272099 and 1272108.

It is not an unprimeable number, because it can be changed into a prime (1272109) 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, 2964 + ... + 3365.

It is an arithmetic number, because the mean of its divisors is an integer number (215220).

2^1272129 is an apocalyptic number.

It is an amenable number.

1272129 is a deficient number, since it is larger than the sum of its proper divisors (449631).

1272129 is an equidigital number, since it uses as much as digits as its factorization.

1272129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399.

The product of its digits is 504, while the sum is 24.

The square root of 1272129 is about 1127.8869624213. The cubic root of 1272129 is about 108.3536929519.

The spelling of 1272129 in words is "one million, two hundred seventy-two thousand, one hundred twenty-nine".