123553439 has 2 divisors, whose sum is σ = 123553440. Its totient is φ = 123553438.

The previous prime is 123553429. The next prime is 123553457. The reversal of 123553439 is 934355321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123553439 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 123553399 and 123553408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123553429) 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 as a sum of consecutive naturals, namely, 61776719 + 61776720.

It is an arithmetic number, because the mean of its divisors is an integer number (61776720).

Almost surely, 2^123553439 is an apocalyptic number.

123553439 is a deficient number, since it is larger than the sum of its proper divisors (1).

123553439 is an equidigital number, since it uses as much as digits as its factorization.

123553439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 35.

The square root of 123553439 is about 11115.4594596895. The cubic root of 123553439 is about 498.0637636563.

The spelling of 123553439 in words is "one hundred twenty-three million, five hundred fifty-three thousand, four hundred thirty-nine".