1386661 has 8 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 1308000.

The previous prime is 1386659. The next prime is 1386667. The reversal of 1386661 is 1666831.

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 1386661 - 2¹ = 1386659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386667) 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, 726 + ... + 1816.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

2^1386661 is an apocalyptic number.

It is an amenable number.

1386661 is a deficient number, since it is larger than the sum of its proper divisors (80987).

1386661 is a wasteful number, since it uses less digits than its factorization.

1386661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163.

The product of its digits is 5184, while the sum is 31.

The square root of 1386661 is about 1177.5657094192. The cubic root of 1386661 is about 111.5124695312.

The spelling of 1386661 in words is "one million, three hundred eighty-six thousand, six hundred sixty-one".