1386643 has 2 divisors, whose sum is σ = 1386644. Its totient is φ = 1386642.

The previous prime is 1386631. The next prime is 1386659. The reversal of 1386643 is 3466831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1386643 - 2⁵ = 1386611 is a prime.

It is a super-3 number, since 3×1386643³ = 7998623330012369121, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1386043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693321 + 693322.

It is an arithmetic number, because the mean of its divisors is an integer number (693322).

2^1386643 is an apocalyptic number.

1386643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1386643 is an equidigital number, since it uses as much as digits as its factorization.

1386643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 1386643 is about 1177.5580665088. The cubic root of 1386643 is about 111.5119870212.

It can be divided in two parts, 1386 and 643, that multiplied together give a palindrome (891198).

The spelling of 1386643 in words is "one million, three hundred eighty-six thousand, six hundred forty-three".