1380641 has 4 divisors (see below), whose sum is σ = 1386900. Its totient is φ = 1374384.

The previous prime is 1380637. The next prime is 1380653. The reversal of 1380641 is 1460831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460831 = 137 ⋅10663.

It can be written as a sum of positive squares in 2 ways, for example, as 1288225 + 92416 = 1135^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380641 - 2² = 1380637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2786 + ... + 3243.

It is an arithmetic number, because the mean of its divisors is an integer number (346725).

2^1380641 is an apocalyptic number.

It is an amenable number.

1380641 is a deficient number, since it is larger than the sum of its proper divisors (6259).

1380641 is an equidigital number, since it uses as much as digits as its factorization.

1380641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6258.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1380641 is about 1175.0068084909. The cubic root of 1380641 is about 111.3508633717.

The spelling of 1380641 in words is "one million, three hundred eighty thousand, six hundred forty-one".