1380640 has 24 divisors (see below), whose sum is σ = 3262140. Its totient is φ = 552192.

The previous prime is 1380637. The next prime is 1380653. The reversal of 1380640 is 460831.

It can be written as a sum of positive squares in 2 ways, for example, as 1373584 + 7056 = 1172^2 + 84^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4155 + ... + 4474.

2^1380640 is an apocalyptic number.

1380640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1380640 is an abundant number, since it is smaller than the sum of its proper divisors (1881500).

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

1380640 is an equidigital number, since it uses as much as digits as its factorization.

1380640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8644 (or 8636 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1380640 is about 1175.0063829614. The cubic root of 1380640 is about 111.3508364878.

The spelling of 1380640 in words is "one million, three hundred eighty thousand, six hundred forty".