123978563 has 4 divisors (see below), whose sum is σ = 124037640. Its totient is φ = 123919488.

The previous prime is 123978559. The next prime is 123978577. The reversal of 123978563 is 365879321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365879321 = 17 ⋅21522313.

It is a cyclic number.

It is not a de Polignac number, because 123978563 - 2² = 123978559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123978523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26270 + ... + 30627.

It is an arithmetic number, because the mean of its divisors is an integer number (31009410).

Almost surely, 2^123978563 is an apocalyptic number.

123978563 is a deficient number, since it is larger than the sum of its proper divisors (59077).

123978563 is an equidigital number, since it uses as much as digits as its factorization.

123978563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59076.

The product of its digits is 272160, while the sum is 44.

The square root of 123978563 is about 11134.5661343404. The cubic root of 123978563 is about 498.6343574366.

The spelling of 123978563 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, five hundred sixty-three".