1271889 has 24 divisors (see below), whose sum is σ = 2013920. Its totient is φ = 793152.

The previous prime is 1271849. The next prime is 1271903. The reversal of 1271889 is 9881721.

It is not a de Polignac number, because 1271889 - 2¹³ = 1263697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1271839) 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, 7722 + ... + 7884.

2^1271889 is an apocalyptic number.

It is an amenable number.

1271889 is a deficient number, since it is larger than the sum of its proper divisors (742031).

1271889 is a wasteful number, since it uses less digits than its factorization.

1271889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 183 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1271889 is about 1127.7805637623. The cubic root of 1271889 is about 108.3468785167.

It can be divided in two parts, 127 and 1889, that added together give a triangular number (2016 = T₆₃).

The spelling of 1271889 in words is "one million, two hundred seventy-one thousand, eight hundred eighty-nine".