123408889 has 4 divisors (see below), whose sum is σ = 123431524. Its totient is φ = 123386256.

The previous prime is 123408871. The next prime is 123408907. The reversal of 123408889 is 988804321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (123408871) and next prime (123408907).

It can be written as a sum of positive squares in 2 ways, for example, as 48066489 + 75342400 = 6933^2 + 8680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123408889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123408289) 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, 2419 + ... + 15895.

It is an arithmetic number, because the mean of its divisors is an integer number (30857881).

Almost surely, 2^123408889 is an apocalyptic number.

It is an amenable number.

123408889 is a deficient number, since it is larger than the sum of its proper divisors (22635).

123408889 is an equidigital number, since it uses as much as digits as its factorization.

123408889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22634.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 123408889 is about 11108.9553514271. The cubic root of 123408889 is about 497.8694531012.

The spelling of 123408889 in words is "one hundred twenty-three million, four hundred eight thousand, eight hundred eighty-nine".