1234456689 has 4 divisors (see below), whose sum is σ = 1645942256. Its totient is φ = 822971124.

The previous prime is 1234456687. The next prime is 1234456697. The reversal of 1234456689 is 9866544321.

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 not a de Polignac number, because 1234456689 - 2¹ = 1234456687 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1234456687) 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, 205742779 + ... + 205742784.

It is an arithmetic number, because the mean of its divisors is an integer number (411485564).

Almost surely, 2^1234456689 is an apocalyptic number.

It is an amenable number.

1234456689 is a deficient number, since it is larger than the sum of its proper divisors (411485567).

1234456689 is an equidigital number, since it uses as much as digits as its factorization.

1234456689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411485566.

The product of its digits is 1244160, while the sum is 48.

The square root of 1234456689 is about 35134.8358328312. The cubic root of 1234456689 is about 1072.7337696583.

The spelling of 1234456689 in words is "one billion, two hundred thirty-four million, four hundred fifty-six thousand, six hundred eighty-nine".