123042005 has 32 divisors (see below), whose sum is σ = 168168960. Its totient is φ = 85847040.

The previous prime is 123042001. The next prime is 123042013. The reversal of 123042005 is 500240321.

It is not a de Polignac number, because 123042005 - 2² = 123042001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123042001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75095 + ... + 76715.

It is an arithmetic number, because the mean of its divisors is an integer number (5255280).

Almost surely, 2^123042005 is an apocalyptic number.

It is an amenable number.

123042005 is a deficient number, since it is larger than the sum of its proper divisors (45126955).

123042005 is a wasteful number, since it uses less digits than its factorization.

123042005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709.

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

The square root of 123042005 is about 11092.4300764080. The cubic root of 123042005 is about 497.3755890351.

Adding to 123042005 its reverse (500240321), we get a palindrome (623282326).

The spelling of 123042005 in words is "one hundred twenty-three million, forty-two thousand, five".