42478123 has 2 divisors, whose sum is σ = 42478124. Its totient is φ = 42478122.

The previous prime is 42478103. The next prime is 42478141. The reversal of 42478123 is 32187424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42478123 - 2²¹ = 40380971 is a prime.

It is not a weakly prime, because it can be changed into another prime (42478103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21239061 + 21239062.

It is an arithmetic number, because the mean of its divisors is an integer number (21239062).

Almost surely, 2^42478123 is an apocalyptic number.

42478123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42478123 is an equidigital number, since it uses as much as digits as its factorization.

42478123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 42478123 is about 6517.5242999163. The cubic root of 42478123 is about 348.9167131574.

The spelling of 42478123 in words is "forty-two million, four hundred seventy-eight thousand, one hundred twenty-three".