123205040 has 40 divisors (see below), whose sum is σ = 327374880. Its totient is φ = 42241536.

The previous prime is 123204979. The next prime is 123205051. The reversal of 123205040 is 40502321.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 109445 + ... + 110564.

It is an arithmetic number, because the mean of its divisors is an integer number (8184372).

Almost surely, 2^123205040 is an apocalyptic number.

123205040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123205040 is an abundant number, since it is smaller than the sum of its proper divisors (204169840).

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

123205040 is a wasteful number, since it uses less digits than its factorization.

123205040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220029 (or 220023 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 123205040 is about 11099.7765743280. The cubic root of 123205040 is about 497.5951721495.

Adding to 123205040 its reverse (40502321), we get a palindrome (163707361).

The spelling of 123205040 in words is "one hundred twenty-three million, two hundred five thousand, forty".