1271389 has 8 divisors (see below), whose sum is σ = 1503360. Its totient is φ = 1052016.

The previous prime is 1271383. The next prime is 1271393. The reversal of 1271389 is 9831721.

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

It is not a de Polignac number, because 1271389 - 2¹⁵ = 1238621 is a prime.

It is a super-3 number, since 3×1271389³ = 6165333923078510607, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1271389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271383) 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, 2929 + ... + 3334.

It is an arithmetic number, because the mean of its divisors is an integer number (187920).

2^1271389 is an apocalyptic number.

It is an amenable number.

1271389 is a deficient number, since it is larger than the sum of its proper divisors (231971).

1271389 is an equidigital number, since it uses as much as digits as its factorization.

1271389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6299.

The product of its digits is 3024, while the sum is 31.

The square root of 1271389 is about 1127.5588676428. The cubic root of 1271389 is about 108.3326790230.

The spelling of 1271389 in words is "one million, two hundred seventy-one thousand, three hundred eighty-nine".