1276820 has 12 divisors (see below), whose sum is σ = 2681364. Its totient is φ = 510720.

The previous prime is 1276817. The next prime is 1276829. The reversal of 1276820 is 286721.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 633616 = 802^2 + 796^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1276820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31901 + ... + 31940.

It is an arithmetic number, because the mean of its divisors is an integer number (223447).

2^1276820 is an apocalyptic number.

1276820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1276820 is an abundant number, since it is smaller than the sum of its proper divisors (1404544).

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

1276820 is a wasteful number, since it uses less digits than its factorization.

1276820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63850 (or 63848 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1276820 is about 1129.9646012155. The cubic root of 1276820 is about 108.4867150164.

Subtracting from 1276820 its reverse (286721), we obtain a palindrome (990099).

The spelling of 1276820 in words is "one million, two hundred seventy-six thousand, eight hundred twenty".