123947651844 has 45 divisors (see below), whose sum is σ = 324040212727. Its totient is φ = 41313771576.

The previous prime is 123947651791. The next prime is 123947651857. The reversal of 123947651844 is 448156749321.

The square root of 123947651844 is 352062.

It is a perfect power (a square), and thus also a powerful number.

123947651844 is a `hidden beast` number, since 1 + 2 + 394 + 76 + 5 + 184 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian 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 in 14 ways as a sum of consecutive naturals, for example, 6327337 + ... + 6346895.

Almost surely, 2^123947651844 is an apocalyptic number.

123947651844 is the 352062-nd square number.

It is an amenable number.

123947651844 is an abundant number, since it is smaller than the sum of its proper divisors (200092560883).

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

123947651844 is an frugal number, since it uses more digits than its factorization.

123947651844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39134 (or 19564 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 123947651844 in words is "one hundred twenty-three billion, nine hundred forty-seven million, six hundred fifty-one thousand, eight hundred forty-four".