1271985 has 32 divisors (see below), whose sum is σ = 2395008. Its totient is φ = 568320.

The previous prime is 1271971. The next prime is 1271987. The reversal of 1271985 is 5891721.

It is not a de Polignac number, because 1271985 - 2⁵ = 1271953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1271987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1849 + ... + 2441.

It is an arithmetic number, because the mean of its divisors is an integer number (74844).

2^1271985 is an apocalyptic number.

1271985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1271985 is a deficient number, since it is larger than the sum of its proper divisors (1123023).

1271985 is a wasteful number, since it uses less digits than its factorization.

1271985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625.

The product of its digits is 5040, while the sum is 33.

The square root of 1271985 is about 1127.8231244304. The cubic root of 1271985 is about 108.3496043937.

It can be divided in two parts, 127 and 1985, that added together give a palindrome (2112).

The spelling of 1271985 in words is "one million, two hundred seventy-one thousand, nine hundred eighty-five".