13456789 has 8 divisors (see below), whose sum is σ = 13872128.
Its totient is φ = 13044240.
The previous prime is 13456739. The next prime is 13456799. The reversal of 13456789 is 98765431.
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 13456789 - 211 = 13454741 is a prime.
It is a Duffinian number.
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 (13456739) 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, 13084 + ... + 14074.
It is an arithmetic number, because the mean of its divisors is an integer number (1734016).
Almost surely, 213456789 is an apocalyptic number.
It is an amenable number.
13456789 is a deficient number, since it is larger than the sum of its proper divisors (415339).
13456789 is an equidigital number, since it uses as much as digits as its factorization.
13456789 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1395.
The product of its digits is 181440, while the sum is 43.
The square root of 13456789 is about 3668.3496289203.
The cubic root of 13456789 is about 237.8558374176.
The spelling of 13456789 in words is "thirteen million, four hundred fifty-six thousand, seven hundred eighty-nine".