1380385 has 8 divisors (see below), whose sum is σ = 1688040. Its totient is φ = 1083264.

The previous prime is 1380377. The next prime is 1380389. The reversal of 1380385 is 5830831.

It can be written as a sum of positive squares in 4 ways, for example, as 654481 + 725904 = 809^2 + 852^2 .

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 1380385 - 2³ = 1380377 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1380389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340 + ... + 2869.

It is an arithmetic number, because the mean of its divisors is an integer number (211005).

2^1380385 is an apocalyptic number.

It is an amenable number.

1380385 is a deficient number, since it is larger than the sum of its proper divisors (307655).

1380385 is an equidigital number, since it uses as much as digits as its factorization.

1380385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5267.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1380385 is about 1174.8978679017. The cubic root of 1380385 is about 111.3439806790.

The spelling of 1380385 in words is "one million, three hundred eighty thousand, three hundred eighty-five".