1233456789 has 8 divisors (see below), whose sum is σ = 1649898432. Its totient is φ = 819659840.

The previous prime is 1233456787. The next prime is 1233456793. The reversal of 1233456789 is 9876543321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1233456789 - 2¹ = 1233456787 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233456787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660084 + ... + 661949.

It is an arithmetic number, because the mean of its divisors is an integer number (206237304).

Almost surely, 2^1233456789 is an apocalyptic number.

It is an amenable number.

1233456789 is a deficient number, since it is larger than the sum of its proper divisors (416441643).

1233456789 is a wasteful number, since it uses less digits than its factorization.

1233456789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322347.

The product of its digits is 1088640, while the sum is 48.

The square root of 1233456789 is about 35120.6034828560. The cubic root of 1233456789 is about 1072.4440561774. Note that the first 3 decimals are identical.

The spelling of 1233456789 in words is "one billion, two hundred thirty-three million, four hundred fifty-six thousand, seven hundred eighty-nine".