123978499 has 2 divisors, whose sum is σ = 123978500. Its totient is φ = 123978498.

The previous prime is 123978497. The next prime is 123978523. The reversal of 123978499 is 994879321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123978499 - 2¹ = 123978497 is a prime.

Together with 123978497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123978493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61989249 + 61989250.

It is an arithmetic number, because the mean of its divisors is an integer number (61989250).

Almost surely, 2^123978499 is an apocalyptic number.

123978499 is a deficient number, since it is larger than the sum of its proper divisors (1).

123978499 is an equidigital number, since it uses as much as digits as its factorization.

123978499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 123978499 is about 11134.5632604068. The cubic root of 123978499 is about 498.6342716352.

The spelling of 123978499 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, four hundred ninety-nine".