420002123 has 2 divisors, whose sum is σ = 420002124. Its totient is φ = 420002122.

The previous prime is 420002101. The next prime is 420002171. The reversal of 420002123 is 321200024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420002123 - 2¹⁴ = 419985739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420002098 and 420002107.

It is not a weakly prime, because it can be changed into another prime (420002623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210001061 + 210001062.

It is an arithmetic number, because the mean of its divisors is an integer number (210001062).

Almost surely, 2^420002123 is an apocalyptic number.

420002123 is a deficient number, since it is larger than the sum of its proper divisors (1).

420002123 is an equidigital number, since it uses as much as digits as its factorization.

420002123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 420002123 is about 20493.9533277501. The cubic root of 420002123 is about 748.8885005353. Note that the first 3 decimals are identical.

Adding to 420002123 its reverse (321200024), we get a palindrome (741202147).

The spelling of 420002123 in words is "four hundred twenty million, two thousand, one hundred twenty-three".