123985646 has 4 divisors (see below), whose sum is σ = 185978472. Its totient is φ = 61992822.

The previous prime is 123985639. The next prime is 123985657. The reversal of 123985646 is 646589321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646589321 = 7 ⋅92369903.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123985597 and 123985606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30996410 + ... + 30996413.

It is an arithmetic number, because the mean of its divisors is an integer number (46494618).

Almost surely, 2^123985646 is an apocalyptic number.

123985646 is a deficient number, since it is larger than the sum of its proper divisors (61992826).

123985646 is an equidigital number, since it uses as much as digits as its factorization.

123985646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61992825.

The product of its digits is 311040, while the sum is 44.

The square root of 123985646 is about 11134.8841933807. The cubic root of 123985646 is about 498.6438530565.

The spelling of 123985646 in words is "one hundred twenty-three million, nine hundred eighty-five thousand, six hundred forty-six".