42920123 has 2 divisors, whose sum is σ = 42920124. Its totient is φ = 42920122.

The previous prime is 42920113. The next prime is 42920159. The reversal of 42920123 is 32102924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42920123 - 2¹⁰ = 42919099 is a prime.

It is not a weakly prime, because it can be changed into another prime (42920113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21460061 + 21460062.

It is an arithmetic number, because the mean of its divisors is an integer number (21460062).

Almost surely, 2^42920123 is an apocalyptic number.

42920123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42920123 is an equidigital number, since it uses as much as digits as its factorization.

42920123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 42920123 is about 6551.3451290556. The cubic root of 42920123 is about 350.1227406248.

The spelling of 42920123 in words is "forty-two million, nine hundred twenty thousand, one hundred twenty-three".