123209847 has 6 divisors (see below), whose sum is σ = 177969792. Its totient is φ = 82139892.

The previous prime is 123209843. The next prime is 123209861. The reversal of 123209847 is 748902321.

It is not a de Polignac number, because 123209847 - 2² = 123209843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123209843) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6844983 + ... + 6845000.

It is an arithmetic number, because the mean of its divisors is an integer number (29661632).

Almost surely, 2^123209847 is an apocalyptic number.

123209847 is a deficient number, since it is larger than the sum of its proper divisors (54759945).

123209847 is a wasteful number, since it uses less digits than its factorization.

123209847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13689989 (or 13689986 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 123209847 is about 11099.9931081060. The cubic root of 123209847 is about 497.6016434997.

The spelling of 123209847 in words is "one hundred twenty-three million, two hundred nine thousand, eight hundred forty-seven".