1260820 has 36 divisors (see below), whose sum is σ = 2915892. Its totient is φ = 457600.

The previous prime is 1260799. The next prime is 1260827. The reversal of 1260820 is 280621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 407044 + 853776 = 638^2 + 924^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2160 + ... + 2680.

It is an arithmetic number, because the mean of its divisors is an integer number (80997).

2^1260820 is an apocalyptic number.

1260820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1260820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1457946).

1260820 is an abundant number, since it is smaller than the sum of its proper divisors (1655072).

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

1260820 is a wasteful number, since it uses less digits than its factorization.

1260820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1260820 is about 1122.8624136554. The cubic root of 1260820 is about 108.0316551013.

It can be divided in two parts, 1260 and 820, that added together give a triangular number (2080 = T₆₄).

The spelling of 1260820 in words is "one million, two hundred sixty thousand, eight hundred twenty".