123449779 has 2 divisors, whose sum is σ = 123449780. Its totient is φ = 123449778.

The previous prime is 123449747. The next prime is 123449791. The reversal of 123449779 is 977944321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123449779 - 2⁵ = 123449747 is a prime.

It is not a weakly prime, because it can be changed into another prime (123149779) 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, 61724889 + 61724890.

It is an arithmetic number, because the mean of its divisors is an integer number (61724890).

Almost surely, 2^123449779 is an apocalyptic number.

123449779 is a deficient number, since it is larger than the sum of its proper divisors (1).

123449779 is an equidigital number, since it uses as much as digits as its factorization.

123449779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The square root of 123449779 is about 11110.7956060761. The cubic root of 123449779 is about 497.9244346456.

The spelling of 123449779 in words is "one hundred twenty-three million, four hundred forty-nine thousand, seven hundred seventy-nine".