1380666 has 32 divisors (see below), whose sum is σ = 3207168. Its totient is φ = 388080.

The previous prime is 1380653. The next prime is 1380671. The reversal of 1380666 is 6660831.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751 + ... + 3213.

It is an arithmetic number, because the mean of its divisors is an integer number (100224).

2^1380666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1380666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603584).

1380666 is an abundant number, since it is smaller than the sum of its proper divisors (1826502).

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

1380666 is a wasteful number, since it uses less digits than its factorization.

1380666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1380666 is about 1175.0174466790. The cubic root of 1380666 is about 111.3515354640.

The spelling of 1380666 in words is "one million, three hundred eighty thousand, six hundred sixty-six".