405212123 has 16 divisors (see below), whose sum is σ = 428008896. Its totient is φ = 383201280.

The previous prime is 405212113. The next prime is 405212147. The reversal of 405212123 is 321212504.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405212123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405212095 and 405212104.

It is not an unprimeable number, because it can be changed into a prime (405212113) 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, 190715 + ... + 192827.

It is an arithmetic number, because the mean of its divisors is an integer number (26750556).

Almost surely, 2^405212123 is an apocalyptic number.

405212123 is a deficient number, since it is larger than the sum of its proper divisors (22796773).

405212123 is a wasteful number, since it uses less digits than its factorization.

405212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 405212123 is about 20129.8813458997. The cubic root of 405212123 is about 739.9927701996.

Adding to 405212123 its reverse (321212504), we get a palindrome (726424627).

The spelling of 405212123 in words is "four hundred five million, two hundred twelve thousand, one hundred twenty-three".