1380845 has 8 divisors (see below), whose sum is σ = 1664664. Its totient is φ = 1099584.

The previous prime is 1380817. The next prime is 1380853. The reversal of 1380845 is 5480831.

It can be written as a sum of positive squares in 4 ways, for example, as 157609 + 1223236 = 397^2 + 1106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1380845 - 2⁶ = 1380781 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 887 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (208083).

2^1380845 is an apocalyptic number.

It is an amenable number.

1380845 is a deficient number, since it is larger than the sum of its proper divisors (283819).

1380845 is an equidigital number, since it uses as much as digits as its factorization.

1380845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1380845 is about 1175.0936132921. The cubic root of 1380845 is about 111.3563474083.

The spelling of 1380845 in words is "one million, three hundred eighty thousand, eight hundred forty-five".