1272139 has 8 divisors (see below), whose sum is σ = 1401840. Its totient is φ = 1144800.

The previous prime is 1272133. The next prime is 1272151. The reversal of 1272139 is 9312721.

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 1272139 - 2¹³ = 1263947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272133) 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 7 ways as a sum of consecutive naturals, for example, 669 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (175230).

2^1272139 is an apocalyptic number.

1272139 is a deficient number, since it is larger than the sum of its proper divisors (129701).

1272139 is a wasteful number, since it uses less digits than its factorization.

1272139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181.

The product of its digits is 756, while the sum is 25.

The square root of 1272139 is about 1127.8913954810. The cubic root of 1272139 is about 108.3539768681.

The spelling of 1272139 in words is "one million, two hundred seventy-two thousand, one hundred thirty-nine".