1388389 has 4 divisors (see below), whose sum is σ = 1391040. Its totient is φ = 1385740.

The previous prime is 1388381. The next prime is 1388393. The reversal of 1388389 is 9838831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1388389 - 2³ = 1388381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388381) 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, 247 + ... + 1684.

It is an arithmetic number, because the mean of its divisors is an integer number (347760).

2^1388389 is an apocalyptic number.

It is an amenable number.

1388389 is a deficient number, since it is larger than the sum of its proper divisors (2651).

1388389 is an equidigital number, since it uses as much as digits as its factorization.

1388389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650.

The product of its digits is 41472, while the sum is 40.

The square root of 1388389 is about 1178.2991979968. The cubic root of 1388389 is about 111.5587710570.

The spelling of 1388389 in words is "one million, three hundred eighty-eight thousand, three hundred eighty-nine".