123820866 has 32 divisors (see below), whose sum is σ = 296325120. Its totient is φ = 38098512.

The previous prime is 123820859. The next prime is 123820883. The reversal of 123820866 is 668028321.

It is a self number, because there is not a number n which added to its sum of digits gives 123820866.

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 15 ways as a sum of consecutive naturals, for example, 87490 + ... + 88893.

It is an arithmetic number, because the mean of its divisors is an integer number (9260160).

Almost surely, 2^123820866 is an apocalyptic number.

123820866 is an abundant number, since it is smaller than the sum of its proper divisors (172504254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123820866 is a wasteful number, since it uses less digits than its factorization.

123820866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176407 (or 176401 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 123820866 is about 11127.4824646009. The cubic root of 123820866 is about 498.4228517709.

The spelling of 123820866 in words is "one hundred twenty-three million, eight hundred twenty thousand, eight hundred sixty-six".