1271220 has 24 divisors (see below), whose sum is σ = 3559584. Its totient is φ = 338976.

The previous prime is 1271213. The next prime is 1271227. The reversal of 1271220 is 221721.

1271220 is nontrivially palindromic in base 8.

It is an interprime number because it is at equal distance from previous prime (1271213) and next prime (1271227).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1271220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271227) 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, 10534 + ... + 10653.

It is an arithmetic number, because the mean of its divisors is an integer number (148316).

2^1271220 is an apocalyptic number.

1271220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271220 is an abundant number, since it is smaller than the sum of its proper divisors (2288364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271220 is a wasteful number, since it uses less digits than its factorization.

1271220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21199 (or 21197 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1271220 is about 1127.4839244974. The cubic root of 1271220 is about 108.3278787523.

1271220 divided by its sum of digits (15) gives a palindrome (84748).

Adding to 1271220 its reverse (221721), we get a palindrome (1492941).

The spelling of 1271220 in words is "one million, two hundred seventy-one thousand, two hundred twenty".