123405345 has 48 divisors (see below), whose sum is σ = 245381760. Its totient is φ = 56201472.

The previous prime is 123405343. The next prime is 123405349. The reversal of 123405345 is 543504321.

123405345 is a `hidden beast` number, since 123 + 4 + 0 + 534 + 5 = 666.

It is not a de Polignac number, because 123405345 - 2¹ = 123405343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123405341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108741 + ... + 109869.

It is an arithmetic number, because the mean of its divisors is an integer number (5112120).

Almost surely, 2^123405345 is an apocalyptic number.

123405345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123405345 is a deficient number, since it is larger than the sum of its proper divisors (121976415).

123405345 is a wasteful number, since it uses less digits than its factorization.

123405345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 123405345 is about 11108.7958393338. The cubic root of 123405345 is about 497.8646871932.

Adding to 123405345 its reverse (543504321), we get a palindrome (666909666).

The spelling of 123405345 in words is "one hundred twenty-three million, four hundred five thousand, three hundred forty-five".