123503905 has 16 divisors (see below), whose sum is σ = 176742144. Its totient is φ = 81005760.

The previous prime is 123503879. The next prime is 123503909. The reversal of 123503905 is 509305321.

It is not a de Polignac number, because 123503905 - 2⁷ = 123503777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123503909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75906 + ... + 77515.

It is an arithmetic number, because the mean of its divisors is an integer number (11046384).

Almost surely, 2^123503905 is an apocalyptic number.

It is an amenable number.

123503905 is a deficient number, since it is larger than the sum of its proper divisors (53238239).

123503905 is a wasteful number, since it uses less digits than its factorization.

123503905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153456.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 123503905 is about 11113.2310783138. The cubic root of 123503905 is about 497.9971949219.

The spelling of 123503905 in words is "one hundred twenty-three million, five hundred three thousand, nine hundred five".