1213789 has 4 divisors (see below), whose sum is σ = 1219456. Its totient is φ = 1208124.

The previous prime is 1213781. The next prime is 1213801. The reversal of 1213789 is 9873121.

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 1213789 - 2³ = 1213781 is a prime.

It is a Duffinian number.

1213789 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213781) 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, 2499 + ... + 2944.

It is an arithmetic number, because the mean of its divisors is an integer number (304864).

2^1213789 is an apocalyptic number.

It is an amenable number.

1213789 is a deficient number, since it is larger than the sum of its proper divisors (5667).

1213789 is an equidigital number, since it uses as much as digits as its factorization.

1213789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666.

The product of its digits is 3024, while the sum is 31.

The square root of 1213789 is about 1101.7209265508. The cubic root of 1213789 is about 106.6713355161.

It can be divided in two parts, 1213 and 789, that added together give a palindrome (2002).

The spelling of 1213789 in words is "one million, two hundred thirteen thousand, seven hundred eighty-nine".