123978523 has 2 divisors, whose sum is σ = 123978524. Its totient is φ = 123978522.

The previous prime is 123978499. The next prime is 123978557. The reversal of 123978523 is 325879321.

It is a weak prime.

It is an emirp because it is prime and its reverse (325879321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123978523 is a prime.

It is not a weakly prime, because it can be changed into another prime (123973523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61989261 + 61989262.

It is an arithmetic number, because the mean of its divisors is an integer number (61989262).

Almost surely, 2^123978523 is an apocalyptic number.

123978523 is a deficient number, since it is larger than the sum of its proper divisors (1).

123978523 is an equidigital number, since it uses as much as digits as its factorization.

123978523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 123978523 is about 11134.5643381320. The cubic root of 123978523 is about 498.6343038108.

The spelling of 123978523 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, five hundred twenty-three".