123994656 has 72 divisors (see below), whose sum is σ = 367960320. Its totient is φ = 39532416.

The previous prime is 123994649. The next prime is 123994657. The reversal of 123994656 is 656499321.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (123994657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2736 + ... + 15983.

It is an arithmetic number, because the mean of its divisors is an integer number (5110560).

Almost surely, 2^123994656 is an apocalyptic number.

123994656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123994656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183980160).

123994656 is an abundant number, since it is smaller than the sum of its proper divisors (243965664).

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

123994656 is a wasteful number, since it uses less digits than its factorization.

123994656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18758 (or 18747 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 123994656 is about 11135.2887703912. The cubic root of 123994656 is about 498.6559315307.

The spelling of 123994656 in words is "one hundred twenty-three million, nine hundred ninety-four thousand, six hundred fifty-six".