123605247240 has 128 divisors (see below), whose sum is σ = 425308492800. Its totient is φ = 31898119680.

The previous prime is 123605247223. The next prime is 123605247253. The reversal of 123605247240 is 42742506321.

123605247240 is a `hidden beast` number, since 1 + 2 + 3 + 60 + 524 + 72 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123605247195 and 123605247204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1812477 + ... + 1879436.

It is an arithmetic number, because the mean of its divisors is an integer number (3322722600).

Almost surely, 2^123605247240 is an apocalyptic number.

123605247240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123605247240 is an abundant number, since it is smaller than the sum of its proper divisors (301703245560).

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

123605247240 is a wasteful number, since it uses less digits than its factorization.

123605247240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691964 (or 3691954 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The spelling of 123605247240 in words is "one hundred twenty-three billion, six hundred five million, two hundred forty-seven thousand, two hundred forty".