1138789 has 4 divisors (see below), whose sum is σ = 1141024. Its totient is φ = 1136556.

The previous prime is 1138777. The next prime is 1138793. The reversal of 1138789 is 9878311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9878311 = 59 ⋅167429.

It is a cyclic number.

It is not a de Polignac number, because 1138789 - 2⁵ = 1138757 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 (1138729) 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, 64 + ... + 1510.

It is an arithmetic number, because the mean of its divisors is an integer number (285256).

2^1138789 is an apocalyptic number.

It is an amenable number.

1138789 is a deficient number, since it is larger than the sum of its proper divisors (2235).

1138789 is an equidigital number, since it uses as much as digits as its factorization.

1138789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234.

The product of its digits is 12096, while the sum is 37.

The square root of 1138789 is about 1067.1405718086. The cubic root of 1138789 is about 104.4273894071.

It can be divided in two parts, 11387 and 89, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 1138789 in words is "one million, one hundred thirty-eight thousand, seven hundred eighty-nine".