123549389 has 4 divisors (see below), whose sum is σ = 123585756. Its totient is φ = 123513024.

The previous prime is 123549347. The next prime is 123549397. The reversal of 123549389 is 983945321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8352100 + 115197289 = 2890^2 + 10733^2 .

It is a cyclic number.

It is not a de Polignac number, because 123549389 - 2²⁴ = 106772173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123549689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12494 + ... + 20079.

It is an arithmetic number, because the mean of its divisors is an integer number (30896439).

Almost surely, 2^123549389 is an apocalyptic number.

It is an amenable number.

123549389 is a deficient number, since it is larger than the sum of its proper divisors (36367).

123549389 is an equidigital number, since it uses as much as digits as its factorization.

123549389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36366.

The product of its digits is 233280, while the sum is 44.

The square root of 123549389 is about 11115.2772794924. The cubic root of 123549389 is about 498.0583215299.

The spelling of 123549389 in words is "one hundred twenty-three million, five hundred forty-nine thousand, three hundred eighty-nine".