1381389 has 4 divisors (see below), whose sum is σ = 1841856. Its totient is φ = 920924.

The previous prime is 1381381. The next prime is 1381397. The reversal of 1381389 is 9831831.

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 an interprime number because it is at equal distance from previous prime (1381381) and next prime (1381397).

It is a cyclic number.

It is not a de Polignac number, because 1381389 - 2³ = 1381381 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381381) 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, 230229 + ... + 230234.

It is an arithmetic number, because the mean of its divisors is an integer number (460464).

2^1381389 is an apocalyptic number.

It is an amenable number.

1381389 is a deficient number, since it is larger than the sum of its proper divisors (460467).

1381389 is an equidigital number, since it uses as much as digits as its factorization.

1381389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460466.

The product of its digits is 5184, while the sum is 33.

The square root of 1381389 is about 1175.3250614192. The cubic root of 1381389 is about 111.3709688658.

It can be divided in two parts, 1381 and 389, that added together give a triangular number (1770 = T₅₉).

The spelling of 1381389 in words is "one million, three hundred eighty-one thousand, three hundred eighty-nine".