123403505 has 16 divisors (see below), whose sum is σ = 149869440. Its totient is φ = 97540608.

The previous prime is 123403457. The next prime is 123403523. The reversal of 123403505 is 505304321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123403505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245084 + ... + 245586.

It is an arithmetic number, because the mean of its divisors is an integer number (9366840).

Almost surely, 2^123403505 is an apocalyptic number.

It is an amenable number.

123403505 is a deficient number, since it is larger than the sum of its proper divisors (26465935).

123403505 is a wasteful number, since it uses less digits than its factorization.

123403505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 123403505 is about 11108.7130217681. The cubic root of 123403505 is about 497.8622127580.

Adding to 123403505 its reverse (505304321), we get a palindrome (628707826).

The spelling of 123403505 in words is "one hundred twenty-three million, four hundred three thousand, five hundred five".