123445789 has 8 divisors (see below), whose sum is σ = 132056568. Its totient is φ = 114984960.

The previous prime is 123445787. The next prime is 123445799. The reversal of 123445789 is 987544321.

It can be written as a sum of positive squares in 4 ways, for example, as 54140164 + 69305625 = 7358^2 + 8325^2 .

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 123445789 - 2¹ = 123445787 is a prime.

It is a super-3 number, since 3×123445789³ (a number of 25 digits) contains 333 as substring.

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 (123445787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35782 + ... + 39079.

It is an arithmetic number, because the mean of its divisors is an integer number (16507071).

Almost surely, 2^123445789 is an apocalyptic number.

It is an amenable number.

123445789 is a deficient number, since it is larger than the sum of its proper divisors (8610779).

123445789 is an equidigital number, since it uses as much as digits as its factorization.

123445789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74975.

The product of its digits is 241920, while the sum is 43.

The square root of 123445789 is about 11110.6160495267. The cubic root of 123445789 is about 497.9190701432.

The spelling of 123445789 in words is "one hundred twenty-three million, four hundred forty-five thousand, seven hundred eighty-nine".