1388643 has 4 divisors (see below), whose sum is σ = 1851528. Its totient is φ = 925760.

The previous prime is 1388641. The next prime is 1388659. The reversal of 1388643 is 3468831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1388643 - 2¹ = 1388641 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1388641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231438 + ... + 231443.

It is an arithmetic number, because the mean of its divisors is an integer number (462882).

2^1388643 is an apocalyptic number.

1388643 is a deficient number, since it is larger than the sum of its proper divisors (462885).

1388643 is an equidigital number, since it uses as much as digits as its factorization.

1388643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462884.

The product of its digits is 13824, while the sum is 33.

The square root of 1388643 is about 1178.4069755394. The cubic root of 1388643 is about 111.5655737135.

The spelling of 1388643 in words is "one million, three hundred eighty-eight thousand, six hundred forty-three".