123540404443 has 2 divisors, whose sum is σ = 123540404444. Its totient is φ = 123540404442.

The previous prime is 123540404371. The next prime is 123540404479. The reversal of 123540404443 is 344404045321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123540404443 - 2¹⁷ = 123540273371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123540404399 and 123540404408.

It is not a weakly prime, because it can be changed into another prime (123540474443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61770202221 + 61770202222.

It is an arithmetic number, because the mean of its divisors is an integer number (61770202222).

Almost surely, 2^123540404443 is an apocalyptic number.

123540404443 is a deficient number, since it is larger than the sum of its proper divisors (1).

123540404443 is an equidigital number, since it uses as much as digits as its factorization.

123540404443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 123540404443 its reverse (344404045321), we get a palindrome (467944449764).

The spelling of 123540404443 in words is "one hundred twenty-three billion, five hundred forty million, four hundred four thousand, four hundred forty-three".