1301780 has 12 divisors (see below), whose sum is σ = 2733780. Its totient is φ = 520704.

The previous prime is 1301779. The next prime is 1301821. The reversal of 1301780 is 871031.

It can be written as a sum of positive squares in 2 ways, for example, as 1008016 + 293764 = 1004^2 + 542^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 65089 = 1301780 / (1 + 3 + 0 + 1 + 7 + 8 + 0).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32525 + ... + 32564.

It is an arithmetic number, because the mean of its divisors is an integer number (227815).

2^1301780 is an apocalyptic number.

1301780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1301780 is an abundant number, since it is smaller than the sum of its proper divisors (1432000).

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

1301780 is a wasteful number, since it uses less digits than its factorization.

1301780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65098 (or 65096 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1301780 is about 1140.9557397200. The cubic root of 1301780 is about 109.1890778791.

The spelling of 1301780 in words is "one million, three hundred one thousand, seven hundred eighty".