42775123 has 4 divisors (see below), whose sum is σ = 43685280. Its totient is φ = 41864968.

The previous prime is 42775097. The next prime is 42775127. The reversal of 42775123 is 32157724.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42775123 - 2¹⁷ = 42644051 is a prime.

It is a super-2 number, since 2×42775123² = 3659422295330258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42775127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455008 + ... + 455101.

It is an arithmetic number, because the mean of its divisors is an integer number (10921320).

Almost surely, 2^42775123 is an apocalyptic number.

42775123 is a deficient number, since it is larger than the sum of its proper divisors (910157).

42775123 is an equidigital number, since it uses as much as digits as its factorization.

42775123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910156.

The product of its digits is 11760, while the sum is 31.

The square root of 42775123 is about 6540.2693369616. The cubic root of 42775123 is about 349.7280145448.

The spelling of 42775123 in words is "forty-two million, seven hundred seventy-five thousand, one hundred twenty-three".