1380864 has 80 divisors (see below), whose sum is σ = 3928320. Its totient is φ = 430080.

The previous prime is 1380853. The next prime is 1380881. The reversal of 1380864 is 4680831.

It is a happy number.

It is a nialpdrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44529 + ... + 44559.

It is an arithmetic number, because the mean of its divisors is an integer number (49104).

2^1380864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1380864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1964160).

1380864 is an abundant number, since it is smaller than the sum of its proper divisors (2547456).

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

1380864 is an equidigital number, since it uses as much as digits as its factorization.

1380864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1380864 is about 1175.1016977266. The cubic root of 1380864 is about 111.3568581489.

The spelling of 1380864 in words is "one million, three hundred eighty thousand, eight hundred sixty-four".