123981866 has 8 divisors (see below), whose sum is σ = 186045120. Its totient is φ = 61966828.

The previous prime is 123981773. The next prime is 123981877. The reversal of 123981866 is 668189321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4736 + ... + 16443.

It is an arithmetic number, because the mean of its divisors is an integer number (23255640).

Almost surely, 2^123981866 is an apocalyptic number.

123981866 is a deficient number, since it is larger than the sum of its proper divisors (62063254).

123981866 is a wasteful number, since it uses less digits than its factorization.

123981866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24108.

The product of its digits is 124416, while the sum is 44.

The square root of 123981866 is about 11134.7144552521. The cubic root of 123981866 is about 498.6387855534.

The spelling of 123981866 in words is "one hundred twenty-three million, nine hundred eighty-one thousand, eight hundred sixty-six".