42123405 has 16 divisors (see below), whose sum is σ = 67697280. Its totient is φ = 22365888.

The previous prime is 42123401. The next prime is 42123449. The reversal of 42123405 is 50432124.

It is not a de Polignac number, because 42123405 - 2² = 42123401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123401) 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, 2697 + ... + 9566.

It is an arithmetic number, because the mean of its divisors is an integer number (4231080).

Almost surely, 2^42123405 is an apocalyptic number.

It is an amenable number.

42123405 is a deficient number, since it is larger than the sum of its proper divisors (25573875).

42123405 is a wasteful number, since it uses less digits than its factorization.

42123405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42123405 is about 6490.2546175015. The cubic root of 42123405 is about 347.9427753045.

Adding to 42123405 its reverse (50432124), we get a palindrome (92555529).

The spelling of 42123405 in words is "forty-two million, one hundred twenty-three thousand, four hundred five".