1234789 has 2 divisors, whose sum is σ = 1234790. Its totient is φ = 1234788.

The previous prime is 1234787. The next prime is 1234799. The reversal of 1234789 is 9874321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 173889 = 1030^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234789 - 2¹ = 1234787 is a prime.

Together with 1234787, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617394 + 617395.

It is an arithmetic number, because the mean of its divisors is an integer number (617395).

2^1234789 is an apocalyptic number.

It is an amenable number.

1234789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234789 is an equidigital number, since it uses as much as digits as its factorization.

1234789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 1234789 is about 1111.2106011013. The cubic root of 1234789 is about 107.2830019626.

The spelling of 1234789 in words is "one million, two hundred thirty-four thousand, seven hundred eighty-nine".